Fix newly reported PHPStan error (#614)

Author: swissspidy

src/User_Meta_Command.php

@@ -341,9 +341,6 @@ protected function delete_metadata( $object_id, $meta_key, $meta_value = '' ) {
 	private function replace_login_with_user_id( $args ) {
 		$user    = $this->fetcher->get_check( $args[0] );
 		$args[0] = $user->ID;
-		// TODO: Improve method type eventually.
-		// Related: https://github.com/phpstan/phpstan/issues/8438.
-		// @phpstan-ignore return.type
 		return $args;
 	}
 }