BugFix inject containers

src/client/js/app.jsx

@@ -251,7 +251,7 @@ if (adminUserGroupPageElem != null) {
 const adminExportPageElem = document.getElementById('admin-export-page');
 if (adminExportPageElem != null) {
   ReactDOM.render(
-    <Provider inject={[]}>
+    <Provider inject={[appContainer, websocketContainer]}>
       <I18nextProvider i18n={i18n}>
         <ExportPage
           crowi={appContainer}