Fix milestone sidebar collapse button
What does this MR do?
Fix milestone sidebar collapse button, a regression caused by me in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/12242 caused by lack of states. Did not know there was a sidebar on milestones. I don't think @iamphill knew either
Are there points in the code the reviewer needs to double check?
Shouldn't be
Why was this MR needed?
Screenshots (if relevant)
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Documentation created/updated -
API support added -
Tests added for this feature/bug - Review
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Has been reviewed by UX -
Has been reviewed by Frontend -
Has been reviewed by Backend -
Has been reviewed by Database
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together