add missing import

Author: simonLeary42

webroot/js/ajax/ssh_validate.php

@@ -2,6 +2,7 @@
 
 require_once __DIR__ . "/../../../vendor/autoload.php";
 require_once __DIR__ . "/../../../resources/lib/utils.php";
+require_once __DIR__ . "/../../../resources/lib/UnityHTTPD.php";
 
 use UnityWebPortal\lib\UnityHTTPD;