Refactor channel map update macros for use with ChannelContext

Author: dunxen

lightning/src/ln/channelmanager.rs

@@ -5667,7 +5667,7 @@ where
 					), chan),
 					// Note that announcement_signatures fails if the channel cannot be announced,
 					// so get_channel_update_for_broadcast will never fail by the time we get here.
-					update_msg: Some(self.get_channel_update_for_broadcast(chan.get()).unwrap()),
+					update_msg: Some(self.get_channel_update_for_broadcast(&chan.get()).unwrap()),
 				});
 			},
 			hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close(format!("Got a message for a channel from the wrong node! No such channel for the passed counterparty_node_id {}", counterparty_node_id), msg.channel_id))