chore: prevent indexing of groups with restricted content access

Author: jeabakker

classes/ColdTrick/GroupTools/PageLayout.php

@@ -21,7 +21,7 @@ public static function noIndexClosedGroups(\Elgg\Event $event): ?array {
 			return null;
 		}
 
-		if ($page_owner->isPublicMembership()) {
+		if ($page_owner->getContentAccessMode() === \ElggGroup::CONTENT_ACCESS_MODE_UNRESTRICTED) {
 			// public group
 			return null;
 		}