[BUG] Fix Ctrl+Enter on editor

- Backport of #2810
- Add event listener for the `ce-quick-submit` event, which will be
triggered if `Ctrl+Enter` is pressed on a text area.
- Regression of 5cc0801de9
- Resolves #2762

(cherry picked from commit 9db76036bb)

web_src/js/features/repo-legacy.js

@@ -445,6 +445,9 @@ async function onEditContent(event) {
       e.preventDefault();
       saveAndRefresh(dz, $dropzone);
     });
+    $editContentZone.on('ce-quick-submit', () => {
+      $editContentZone.find('.save.button').trigger('click');
+    });
   } else {
     comboMarkdownEditor = getComboMarkdownEditor($editContentZone.find('.combo-markdown-editor'));
   }