Add namespace to get_option call in Mailer class

Prefixed get_option with a backslash to ensure the global function is used, improving reliability in namespaced contexts.

Author: pfefferle

includes/class-mailer.php

@@ -466,7 +466,7 @@ public static function maybe_prevent_comment_notification( $maybe_notify, $comme
 		}
 
 		// Only prevent if the create_posts option is enabled.
-		if ( '1' !== get_option( 'activitypub_create_posts', false ) ) {
+		if ( '1' !== \get_option( 'activitypub_create_posts', false ) ) {
 			return $maybe_notify;
 		}