openingd: Tentatively accept zeroconf when proposed

We then still use our own minimum_depth to enforce our security. There
is no harm in accepting theirs

openingd/openingd.c

@@ -965,12 +965,16 @@ static u8 *fundee_channel(struct state *state, const u8 *open_channel_msg)
 	 */
 	if (open_tlvs->channel_type) {
 		open_channel_had_channel_type = true;
+		/* Tentatively accept OPT_ZEROCONF. We'll check
+		 * further down again. This is required because we
+		 * haven't talked to the openchannel hook at this
+		 * point. */
 		state->channel_type =
 			channel_type_accept(state,
 					    open_tlvs->channel_type,
 					    state->our_features,
 					    state->their_features,
-					    state->minimum_depth == 0);
+					    true);
 		if (!state->channel_type) {
 			negotiation_failed(state,
 					   "Did not support channel_type %s",