Add api_status checks for user preferences API

app/controllers/api/user_preferences_controller.rb

@@ -1,6 +1,8 @@
 # Update and read user preferences, which are arbitrary key/val pairs
 module Api
   class UserPreferencesController < ApiController
+    before_action :check_api_readable
+    before_action :check_api_writable, :only => [:update_all, :update, :destroy]
     before_action :authorize
 
     authorize_resource