Add ws address to start QR code

cmd/txqr-tester/app/start_qr.go

@@ -11,7 +11,7 @@ import (
 // StartQR renders the QR code with information needed to start
 // a new testing from smartphone.
 func (a *App) StartQR() vecty.ComponentOrHTML {
-	img, err := qr.Encode("test", 500, qr.Medium)
+	img, err := qr.Encode(a.wsAddress, 500, qr.Medium)
 	if err != nil {
 		// TODO(divan): display the error nicely (why this can even happen?)
 		return elem.Div(vecty.Text(fmt.Sprintf("qr error: %v", err)))