cmd/tsconnect: fix forgotten API change for wasm

Fix regression from 6e967446e4

Updates #8036

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

cmd/tsconnect/wasm/wasm_js.go

@@ -101,7 +101,8 @@ func newIPN(jsConfig js.Value) map[string]any {
 	sys.Set(store)
 	dialer := &tsdial.Dialer{Logf: logf}
 	eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
-		Dialer: dialer,
+		Dialer:       dialer,
+		SetSubsystem: sys.Set,
 	})
 	if err != nil {
 		log.Fatal(err)