tapchannel: use trace log level for unhandled channel update messages

Change the log level from debug to trace for unhandled channel update
messages. This reduces noise in the debug logs while still allowing
visibility when needed.

Author: ffranr

tapchannel/aux_funding_controller.go

@@ -2136,8 +2136,8 @@ func (f *FundingController) CanHandle(msg msgmux.PeerMsg) bool {
 		return true
 	}
 
-	log.Debugf("Failed to handle: %T", msg.Message)
-
+	log.Tracef("FundingController encountered an unsupported message "+
+		"type: %T", msg.Message)
 	return false
 }