Move reload initiation to an explicit initialize function

The reload initiation is required to run before other parts of the site
are started so that page_params will be setup correctly. This moves that
initiation out of an on ready handler to an explicit initialize call
near where the rest of the app is started.

(imported from commit b8994311299327aa3cfa57e3d9e92124a47123f4)

static/js/ui.js

@@ -1474,6 +1474,7 @@ $(function () {
     }
 
     // initialize other stuff
+    reload.initialize();
     composebox_typeahead.initialize();
     search.initialize();
     notifications.initialize();