[Webhook] Fix controller service name

Author: HypeMC

src/Symfony/Bundle/FrameworkBundle/Resources/config/routing/webhook.php

@@ -24,7 +24,7 @@
     }
 
     $routes->add('_webhook_controller', '/{type}')
-        ->controller('webhook_controller::handle')
+        ->controller('webhook.controller::handle')
         ->requirements(['type' => '.+'])
     ;
 };