wgengine: add required NewFakeRouter parameter

Signed-off-by: wardn <wardn@users.noreply.github.com>

wgengine/router_default.go

@@ -13,5 +13,5 @@ import (
 )
 
 func NewUserspaceRouter(logf logger.Logf, tunname string, dev *device.Device, tuntap tun.Device, netChanged func()) Router {
-	return NewFakeRouter(logf, tunname, dev, tuntap)
+	return NewFakeRouter(logf, tunname, dev, tuntap, netChanged)
 }