add missing require to ssh_validate.php

Author: simonLeary42

webroot/js/ajax/ssh_validate.php

@@ -1,5 +1,6 @@
 <?php
 
 require_once __DIR__ . "/../../../resources/lib/UnitySite.php";
+require_once __DIR__ . "/../../../vendor/autoload.php";
 
 echo UnityWebPortal\lib\UnitySite::testValidSSHKey($_POST["key"]) ? "true" : "false";