fix: Add request validation to prevent untrusted access in configuration update

GHSA-vvfw-4m39-fjqf

Author: Daniel Neto

objects/configurationUpdate.json.php

@@ -15,6 +15,8 @@
 require_once $global['systemRootPath'] . 'objects/configuration.php';
 require_once $global['systemRootPath'] . 'objects/functions.php';
 
+forbidIfIsUntrustedRequest('configurationUpdate');
+
 _error_log("save configuration {$_POST['language']}");
 
 $config = new AVideoConf();