Merge branch 'ee-sidebar-collapse-button-padding' into 'master'

Restore sidebar collapse button padding (EE Version)

See merge request gitlab-org/gitlab-ee!3975

app/assets/stylesheets/pages/issuable.scss

@@ -303,7 +303,6 @@
     .gutter-toggle {
       margin-top: 7px;
       border-left: 1px solid $border-gray-normal;
-      padding-left: 0;
       text-align: center;
     }
 

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

+.right-sidebar.right-sidebar-collapsed .sidebar-grouped-item .gutter-toggle {
+  padding-left: auto;
+}