FIX: `ForumsController` doesn't need to inherit from `ApplicationController`.

Application controller has a whole bunch of before/after actions which
we have no need for.

app/controllers/forums_controller.rb

@@ -1,11 +1,6 @@
 # frozen_string_literal: true
 
-class ForumsController < ApplicationController
-
-  skip_before_action :preload_json, :check_xhr
-  skip_before_action :authorize_mini_profiler, only: [:status]
-  skip_before_action :redirect_to_login_if_required, only: [:status]
-
+class ForumsController < ActionController::Base
   def status
     if $shutdown
       render plain: 'shutting down', status: 500