Fix regression with UUID showing the id

Bug: Issue 12725
Change-Id: I0601016c5b4be5f5a64f37c61023d0d6cb61fb6f

polygerrit-ui/app/elements/admin/gr-group/gr-group_html.js

@@ -43,7 +43,10 @@ export const htmlTemplate = html`
         <fieldset>
           <h3 id="groupUUID">Group UUID</h3>
           <fieldset>
-            <gr-copy-clipboard text="[[groupId]]"></gr-copy-clipboard>
+            <gr-copy-clipboard
+              id="uuid"
+              text="[[_groupConfig.id]]"
+            ></gr-copy-clipboard>
           </fieldset>
           <h3 id="groupName" class$="[[_computeHeaderClass(_rename)]]">
             Group Name

polygerrit-ui/app/elements/admin/gr-group/gr-group_test.html

@@ -271,5 +271,13 @@ suite('gr-group tests', () => {
 
     element._loadGroup();
   });
+
+  test('uuid', () => {
+    element._groupConfig = {
+      id: '6a1e70e1a88782771a91808c8af9bbb7a9871389',
+    };
+
+    assert.equal(element._groupConfig.id, element.$.uuid.text);
+  });
 });
 </script>