use require_once kerio api

app/Http/Actions/TestConnection.php

@@ -7,7 +7,7 @@ use ThurData\Servers\KerioEmail\App\Libs\Kerio\Components\Api\Soap\Client;
 use ThurData\Servers\KerioEmail\App\Traits\ExtensionsCheckerTrait;
 use ThurData\Servers\KerioEmail\Core\App\Controllers\Instances\AddonController;
 
-require_once(dirname(__FILE__) . '/api/KerioConnectApi.php');
+require_once __DIR__ . '/api/KerioConnectApi.php';
 /**
  *
  * Created by PhpStorm.