df-open: send the tx-sigs from channeld, check that we send it at the

...right time.

We re-send the tx_sigs on start/init/reconnect until we've gotten a
funding_locked from our peer. We also build it in channeld now, instead
of in dualopend, and don't pass in a message for them anymore

lightningd/peer_control.c

@@ -1055,7 +1055,7 @@ peer_connected_hook_cb(struct peer_connected_hook_payload *payload STEALS,
 
 			channel->peer->addr = addr;
 			peer_start_channeld(channel, payload->pps,
-					    NULL, NULL,
+					    NULL, channel->psbt,
 					    true);
 			tal_free(payload);
 			return;