remove use of PConfig Class from Probe class because we don't use it here

src/Network/Probe.php

@@ -10,7 +10,6 @@ namespace Friendica\Network;
 
 use Friendica\App;
 use Friendica\Core\Config;
-use Friendica\Core\PConfig;
 
 require_once 'include/feed.php';
 require_once 'include/email.php';