Add element container to dropdowns

app/views/projects/protected_branches/_create_protected_branch.html.haml

@@ -22,16 +22,18 @@
           %label.col-md-2.text-right{ for: 'merge_access_levels_attributes' }
             Allowed to merge:
           .col-md-10
-            = dropdown_tag('Select',
-                           options: { toggle_class: 'js-allowed-to-merge wide',
-                           data: { field_name: 'protected_branch[merge_access_levels_attributes][0][access_level]', input_id: 'merge_access_levels_attributes' }})
+            .js-allowed-to-merge-container
+              = dropdown_tag('Select',
+                             options: { toggle_class: 'js-allowed-to-merge wide',
+                             data: { field_name: 'protected_branch[merge_access_levels_attributes][0][access_level]', input_id: 'merge_access_levels_attributes' }})
         .form-group
           %label.col-md-2.text-right{ for: 'push_access_levels_attributes' }
             Allowed to push:
           .col-md-10
-            = dropdown_tag('Select',
-                           options: { toggle_class: 'js-allowed-to-push wide',
-                           data: { field_name: 'protected_branch[push_access_levels_attributes][0][access_level]', input_id: 'push_access_levels_attributes' }})
+            .js-allowed-to-push-container
+              = dropdown_tag('Select',
+                             options: { toggle_class: 'js-allowed-to-push wide',
+                             data: { field_name: 'protected_branch[push_access_levels_attributes][0][access_level]', input_id: 'push_access_levels_attributes' }})
 
     .panel-footer
       = f.submit 'Protect', class: 'btn-create btn', disabled: true