impl Borrow<[u8]> for ChannelId

We do this for `Payment*` in `lightning-types` and its needed for
the `hex_conservaitve` `impl_fmt_traits` macro which we'll use in
the next commit.

Author: TheBlueMatt

lightning/src/ln/channelmanager.rs

@@ -7135,7 +7135,7 @@ where
 				chan
 			} else {
 				let update_actions = peer_state.monitor_update_blocked_actions
-					.remove(&channel_id).unwrap_or(Vec::new());
+					.remove(channel_id).unwrap_or(Vec::new());
 				mem::drop(peer_state_lock);
 				mem::drop(per_peer_state);
 				self.handle_monitor_update_completion_actions(update_actions);

lightning/src/ln/types.rs

@@ -30,6 +30,7 @@ use bitcoin::hashes::{
 	HashEngine as _,
 	sha256::Hash as Sha256,
 };
+use core::borrow::Borrow;
 use core::fmt;
 use core::ops::Deref;
 
@@ -127,6 +128,12 @@ impl fmt::Display for ChannelId {
 	}
 }
 
+impl Borrow<[u8]> for ChannelId {
+	fn borrow(&self) -> &[u8] {
+		&self.0[..]
+	}
+}
+
 pub use lightning_types::payment::{PaymentHash, PaymentPreimage, PaymentSecret};
 
 #[cfg(test)]