Mega Main Menu - WordPress Menu Plugin 2.2.4

- Fixed PHP-error in the "g_elements_map.php" file.
Reported in the comments ( https://codecanyon.net/item/mega-main-menu-wordpress-menu-plugin/6135125/comments#comment_31197042 )

- Improved compatibility with WordPress 6.6.
- Improved compatibility with PHP 8.3.