chore(upnp): remove incorrect embedding of nat.Service (fixes #10426) (#10428)

lib/upnp/igd_service.go

@@ -56,8 +56,6 @@ type IGDService struct {
 	URN       string
 	LocalIPv4 net.IP
 	Interface *net.Interface
-
-	nat.Service
 }
 
 // AddPinhole adds an IPv6 pinhole in accordance to http://upnp.org/specs/gw/UPnP-gw-WANIPv6FirewallControl-v1-Service.pdf