Update sites_database_user_add.php, fix typo

Author: Balázs Kelemen

remoting_client/examples/sites_database_user_add.php

@@ -22,7 +22,7 @@
 		'database_password' => 'db_name2'
 	);
 
-	$database_id = $client->sites_database_user_add($session_id, $client_id, $params);
+	$database_user_id = $client->sites_database_user_add($session_id, $client_id, $params);
 
 	echo "Database ID: ".$database_user_id."<br>";