Typo in class name of submit button on merge requests settings form

Summary

Submit button at Merge request settings form has wrong color because 1 month ago there was a mistake in the class btn-succes instead of btn-success.

Steps to reproduce

1. Go to Sidebar → Settings → General → Merge Requests;
2. Look at the submit button "Save changes".

Example Project

What is the current bug behavior?

Button is white, element contains class btn-succes.

What is the expected correct behavior?

Button is green, element contains class btn-success.

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes

!42052 (merged)