lightningd: delete all trace of nonexistent channels.

We're going to start loading them into memory for nicer responses if
people try to reestablish closed channels, but we don't care about ones
which were never actually opened.  We could add a new state, but easier
to simply remove them.

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

lightningd/peer_control.c

@@ -519,7 +519,7 @@ void channel_errmsg(struct channel *channel,
 	if (channel_state_uncommitted(channel->state)) {
 		log_info(channel->log, "%s", "Unsaved peer failed."
 			 " Deleting channel.");
-		delete_channel(channel);
+		delete_channel(channel, false);
 		return;
 	}
 
@@ -3432,7 +3432,7 @@ static void process_dev_forget_channel(struct bitcoind *bitcoind UNUSED,
 	forget->channel->error = towire_errorfmt(forget->channel,
 						 &forget->channel->cid,
 						 "dev_forget_channel");
-	delete_channel(forget->channel);
+	delete_channel(forget->channel, false);
 
 	was_pending(command_success(forget->cmd, response));
 }