Update MR diff blob_fork_suggestion after jQuery update

`.init()` was added in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/10858

We need to add it the MR diff instance that was added in a separate MR
and of course didn't add a conflict because it is a completely different
piece

app/assets/javascripts/merge_request_tabs.js

@@ -275,7 +275,8 @@ import BlobForkSuggestion from './blob/blob_fork_suggestion';
               cancelButtons: $(el).find('.js-cancel-fork-suggestion-button'),
               suggestionSections: $(el).find('.js-file-fork-suggestion-section'),
               actionTextPieces: $(el).find('.js-file-fork-suggestion-section-action'),
-            });
+            })
+              .init();
           });
         },
       });