peer: soft-disable towers with taproot channels

In this commit, we modify the starting logic to note attempt to add a
tower client for taproot channels. Instead, we'll just log that this
isn't available yet.

peer/brontide.go

@@ -973,9 +973,23 @@ func (p *Brontide) addLink(chanPoint *wire.OutPoint,
 	// okay if the clients are disabled altogether and these values are nil,
 	// as the link will check for nilness before using either.
 	var towerClient htlcswitch.TowerClient
-	if chanType.HasAnchors() {
+	switch {
+	case chanType.IsTaproot():
+		// Leave the tower client as nil for now until the tower client
+		// has support for taproot channels.
+		//
+		// If the user has activated the tower client, then add a log
+		// to explain that any taproot channel updates wil not be
+		// backed up to a tower.
+		if p.cfg.TowerClient != nil {
+			p.log.Debugf("Updates for channel %s will not be "+
+				"backed up to a watchtower as watchtowers "+
+				"are not yet taproot channel compatible",
+				chanPoint)
+		}
+	case chanType.HasAnchors():
 		towerClient = p.cfg.AnchorTowerClient
-	} else {
+	default:
 		towerClient = p.cfg.TowerClient
 	}