add missing padding for commit -> builds page

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/views/projects/commit/builds.html.haml

 - page_title "Builds", "#{@commit.title} (#{@commit.short_id})", "Commits"
 = render "projects/commits/header_title"
-= render "commit_box"
+.prepend-top-default
+  = render "commit_box"
 = render "ci_menu"
 
 = render "builds"