ui: fix signInDialog error display (#1003)

Author: pandadtdyy

packages/ui-default/components/signin/signInDialog.page.js

@@ -3,6 +3,7 @@ import $ from 'jquery';
 import responsiveCutoff from 'vj/breakpoints.json';
 import DomDialog from 'vj/components/dialog/DomDialog';
 import { InfoDialog } from 'vj/components/dialog/index';
+import Notification from 'vj/components/notification';
 import { AutoloadPage } from 'vj/misc/Page';
 import {
   i18n, mediaQuery, request, tpl,