FIX: Sync user's notification channel before preloaded current user data.

This is to fix the problem where a newly created user would not
receive live updates for the first notification if the notification
is published before the client has subscribed to the channel.

app/controllers/application_controller.rb

@@ -230,8 +230,8 @@ class ApplicationController < ActionController::Base
     preload_anonymous_data
 
     if current_user
-      preload_current_user_data
       current_user.sync_notification_channel_position
+      preload_current_user_data
     end
   end