routing: relax penalties for channel disabled errors

It was being considered a misbehaviour from the intermediate hop which
penalized that hop, which is a bit harsh considering mobile nodes. We
change it be considered as other channel update types and only penalize
the channel that failed.

docs/release-notes/release-notes-0.14.0.md

@@ -296,6 +296,12 @@ you.
 * [Save compressed log files from logrorate during 
   itest](https://github.com/lightningnetwork/lnd/pull/5354).
 
+## Mission control
+
+* [Interpretation of channel disabled errors was changed to only penalize t
+  he destination node to consider mobile wallets with hub 
+  nodes.](https://github.com/lightningnetwork/lnd/pull/5598)
+
 ## Bug Fixes
 
 * A bug has been fixed that would cause `lnd` to [try to bootstrap using the