chore(PortForward): make 'target' field use internal_direct

Author: jaredhendrickson13

pfSense-pkg-RESTAPI/files/usr/local/pkg/RESTAPI/Models/PortForward.inc

@@ -109,6 +109,7 @@ class PortForward extends Model {
             allow_self: false,
             allow_l2tp: false,
             allow_pppoe: false,
+            internal_direct: true,
             help_text: 'The IP address or alias of the internal host to forward matching traffic to.',
         );
         $this->local_port = new PortField(