channeld: send option_data_loss_protect fields.

We ignore incoming for now, but this means we advertize the option and
we send the required fields.

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

common/features.c

@@ -4,6 +4,7 @@
 #include <wire/peer_wire.h>
 
 static const u32 local_features[] = {
+	LOCAL_DATA_LOSS_PROTECT,
 	LOCAL_INITIAL_ROUTING_SYNC,
 	LOCAL_GOSSIP_QUERIES
 };