Fixed lingering upstream Theme code

app/views/layouts/error.html.haml

@@ -6,7 +6,7 @@
     %title= safe_join([yield(:page_title), title], ' - ')
     %meta{ content: 'width=device-width,initial-scale=1', name: 'viewport' }/
     = stylesheet_pack_tag 'common', media: 'all'
-    = stylesheet_pack_tag Setting.default_settings['theme'], media: 'all'
+    = stylesheet_pack_tag 'application', integrity: true, media: 'all'
   %body.error
     .dialog
       %img{ alt: title, src: '/oops.gif' }/