fixup! add channel <-> channel monitor consistency check

Author: joostjager

lightning/src/ln/channelmanager.rs

@@ -17042,7 +17042,7 @@ where
 						should_broadcast: true,
 					}],
 					channel_id: Some(monitor.channel_id()),
-					encoded_channel: None,
+					encoded_channel: Some(Vec::new()),
 				};
 				let funding_txo = monitor.get_funding_txo();
 				let update = BackgroundEvent::MonitorUpdateRegeneratedOnStartup {