elements: Tell channeld that we're dealing with elements txs

Signed-off-by: Christian Decker <decker.christian@gmail.com>

channeld/channeld.c

@@ -3002,6 +3002,7 @@ static void init_channel(struct peer *peer)
 	/* stdin == requests, 3 == peer, 4 = gossip, 5 = gossip_store, 6 = HSM */
 	per_peer_state_set_fds(peer->pps, 3, 4, 5);
 
+	is_elements = chainparams_by_chainhash(&peer->chain_hash)->is_elements;
 	status_debug("init %s: remote_per_commit = %s, old_remote_per_commit = %s"
 		     " next_idx_local = %"PRIu64
 		     " next_idx_remote = %"PRIu64