WIP: Clean up new dropdown styles
What does this MR do?
Cleans up the changes made by merge requests linked in https://gitlab.com/gitlab-org/gitlab-ce/issues/28921#note_36011920.
Why was this MR needed?
The new dropdown style was applied per page. This merge request activates it globally.
Screenshots
See linked merge requests in https://gitlab.com/gitlab-org/gitlab-ce/issues/28921#note_36011920.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary