[ticket/13454] Remove unused variables

This is part 2 of the pr.

PHPBB3-13454

phpBB/includes/functions_module.php

@@ -387,8 +387,7 @@ class p_master
 	*/
 	static function module_auth($module_auth, $forum_id)
 	{
-		global $auth, $config;
-		global $request, $phpbb_extension_manager, $phpbb_dispatcher;
+		global $phpbb_dispatcher;
 
 		$module_auth = trim($module_auth);