Merge branch '23918-reaction-button-style' into 'master'

Correct padding and alignment for reaction buttons

## What does this MR do?
Fixes padding and alignment for reaction buttons on issues.

## Screenshots (if relevant)

### Before
![img](https://gitlab.com/gitlab-org/gitlab-ce/uploads/ae788883aca84799fca9cd23f8e16f28/image.png)
![img](https://gitlab.com/gitlab-org/gitlab-ce/uploads/b2f5aa45dbb4899f054f839bd9046bb6/image.png)

### After
![Screen_Shot_2016-10-28_at_3.56.03_PM](/uploads/0b1affed448f6ec24fa56e7800daf753/Screen_Shot_2016-10-28_at_3.56.03_PM.png)
![Screen_Shot_2016-10-28_at_3.56.09_PM](/uploads/311bb59dc6eea8cd124232ebe647b5ef/Screen_Shot_2016-10-28_at_3.56.09_PM.png)

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG.md) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?


Closes #23918

See merge request !7182
81 jobs for master in 62 minutes and 44 seconds (queued for 1 minute and 22 seconds)
Status Job ID Name Coverage
  Prepare
passed #5748216
knapsack

00:00:54

 
  Test
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bundler:audit

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bundler:check

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migration paths

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rake brakeman

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rake db:migrate:reset

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spinach 0 10

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  Post Test
skipped #5748323
coverage
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trigger_docs
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update-knapsack
 
  Pages
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pages
 
Name Stage Failure
failed
rspec 14 20 ruby21 Test There is an unknown failure, please try again
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

/usr/local/bundle/gems/knapsack-1.13.0/lib/knapsack/runners/rspec_runner.rb:18:in `run': undefined method `zero?' for nil:NilClass (NoMethodError)
from /usr/local/bundle/gems/knapsack-1.13.0/bin/knapsack:18:in `<top (required)>'
from /usr/local/bundle/bin/knapsack:22:in `load'
from /usr/local/bundle/bin/knapsack:22:in `<main>'
ERROR: Build failed: exit code 1
failed
rspec 19 20 ruby21 Test There is an unknown failure, please try again
Starting service redis:alpine ...
Waiting for services to be up and running...
Pulling docker image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.1-git-2.7-phantomjs-2.1 ...
Running on runner-30d62d59-project-13083-concurrent-0 via runner-30d62d59-auto-scale-1478009416-322117de...
Cloning repository for master with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ce'...
error: RPC failed; HTTP 502 curl 22 The requested URL returned error: 502 Bad Gateway
fatal: The remote end hung up unexpectedly
ERROR: Build failed: exit code 1
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bundler:audit Test There is an unknown failure, please try again
Running with gitlab-ci-multi-runner 1.7.0-rc.2 (75c65d8)
Using Docker executor with image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.3-git-2.7-phantomjs-2.1 ...
Pulling docker image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.3-git-2.7-phantomjs-2.1 ...
Running on runner-30d62d59-project-13083-concurrent-0 via runner-30d62d59-auto-scale-1478002718-20808692...
Cloning repository for master with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ce'...
error: RPC failed; HTTP 502 curl 22 The requested URL returned error: 502 Bad Gateway
fatal: The remote end hung up unexpectedly
ERROR: Build failed: exit code 1
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spinach 7 10 ruby21 Test There is an unknown failure, please try again
Starting service redis:alpine ...
Waiting for services to be up and running...
Pulling docker image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.1-git-2.7-phantomjs-2.1 ...
Running on runner-9fa978b6-project-13083-concurrent-0 via runner-9fa978b6-auto-scale-1478002799-27a03352...
Cloning repository for master with git depth set to 20...
Cloning into '/builds/gitlab-org/gitlab-ce'...
error: RPC failed; HTTP 502 curl 22 The requested URL returned error: 502 Bad Gateway
fatal: The remote end hung up unexpectedly
ERROR: Build failed: exit code 1
failed
spinach 2 10 ruby21 Test There is an unknown failure, please try again
  /builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/gems/spinach-0.8.10/lib/spinach/hookable.rb:28:in `block in hook'
/builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/gems/spinach-0.8.10/lib/spinach/runner.rb:68:in `run'
/builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/gems/spinach-0.8.10/lib/spinach/cli.rb:27:in `run'
/builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/gems/spinach-0.8.10/bin/spinach:15:in `<top (required)>'
/builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/bin/spinach:22:in `load'
/builds/gitlab-org/gitlab-ce/vendor/ruby/2.1.0/bin/spinach:22:in `<top (required)>'
Retrying 2...
Retrying 1...
ERROR: Build failed: exit code 1