Merge branch 'winh-remove-safari-search-box-workaround' into 'master'

Remove workaround for search box icons in Safari

Closes gitlab-ui#156 and #9240

See merge request gitlab-org/gitlab-ee!9439

ee/app/assets/stylesheets/pages/boards.scss

@@ -109,10 +109,4 @@
     // see https://gitlab.com/gitlab-org/gitlab-ui/issues/38
     display: flex;
   }
-
-  // the following is a workaround until we have it fixed in gitlab-ui
-  // see https://gitlab.com/gitlab-org/gitlab-ui/issues/156
-  .sticky-top {
-    top: 0;
-  }
 }