New branch form dropdown spacing incorrect

The spacing & positioning of the branch dropdown in the new branch form is incorrect:

foo/bar/branches/new

assigned to @MadLittleMods

mentioned in commit 15c90cc2

mentioned in merge request !11279 (merged)

mentioned in commit d35b4981

mentioned in commit 087ea003

closed via merge request !11279 (merged)

mentioned in commit e840ec1b

mentioned in commit aa7f474c

mentioned in commit nick.thomas/gitlab-ee@cc572c43

mentioned in merge request !14785