add missing require statement and don't require self

app/assets/javascripts/application.js

@@ -105,8 +105,8 @@ require('./droplab/droplab_filter');
 require('./abuse_reports');
 require('./activities');
 require('./admin');
+require('./ajax_loading_spinner');
 require('./api');
-require('./application');
 require('./aside');
 require('./autosave');
 require('./awards_handler');