Smartly remove custom collections that are already present

Author: iMattPro

event/main_listener.php

@@ -107,24 +107,12 @@ public function __construct(auth $auth, config $config, db_text $config_text, la
 	 */
 	public function add_custom_sites($event)
 	{
-		$phpbb4_builtins = array_flip([
-			'applepodcasts',
-			'bluesky',
-			'bunny',
-			'facebook',
-			'mastodon',
-			'pastebin',
-			'threads',
-			'twitter',
-			'vk',
-		]);
-
 		foreach ($this->custom_sites->get_collection() as $site)
 		{
 			$name = basename($site, ext::YML);
 
-			// Skip built-in sites when running phpBB 4
-			if (isset($phpbb4_builtins[$name]) && $this->is_phpbb4())
+			// Skip sites already defined as built-ins in phpBB 4
+			if ($this->is_phpbb4() && $event['configurator']->MediaEmbed->defaultSites->exists($name))
 			{
 				continue;
 			}