Change port checker api back to yougetsignal

There are issues with the portchecker.co API. It does not work 100% of the time.

plugins/check_port/conf.php

@@ -1,7 +1,7 @@
 <?php
 // configuration parameter
 
-$useWebsite = "portchecker";	// Valid choices:
+$useWebsite = "yougetsignal";	// Valid choices:
 				// false - disable check_port plugin
 				// "yougetsignal" - use https://www.yougetsignal.com/tools/open-ports/
 				// "portchecker" - use https://portchecker.co/