The "x/y discussions resolved" button on merge request page is 1px too tall

Summary

The "x/y discussions resolved" button on merge request page is 1px too tall

Steps to reproduce

Go to an merge request with open discussions.

Example: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15621

This can be reproduced in Chrome, Firefox and IE on Win10.

/cc @iamphill