subd: handle status_peer_billboard messages from subdaemons.

We use a callback which updates the appropriate slot.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

lightningd/onchain_control.c

@@ -372,6 +372,7 @@ enum watch_result funding_spent(struct channel *channel,
 						    onchain_wire_type_name,
 						    onchain_msg,
 						    onchain_error,
+						    channel_set_billboard,
 						    NULL));
 
 	if (!channel->owner) {