Fix vertical align on group list

The setting icon on groups list is not vertically aligned. This merge
request is fixing that.
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/groups/components/item_actions.vue

@@ -68,7 +68,7 @@ export default {
       data-placement="bottom"
       class="edit-group btn btn-xs no-expand"
     >
-      <icon name="settings" class="position-top-0" />
+      <icon name="settings" class="position-top-0 align-middle" />
     </a>
   </div>
 </template>