Removing trailing comma in WAF constructor to be compatible with PHP 7.2

Author: ivanviduka

Controller/Adminhtml/FastlyCdn/Waf/WafAllowlist.php

@@ -78,7 +78,7 @@ public function __construct(
         $this->config = $config;
         $this->api = $api;
         $this->vcl = $vcl;
-        parent::__construct($context, );
+        parent::__construct($context);
     }
 
     /**