peer: fix MarkCoopBroadcasted to correctly use local parameter

docs/release-notes/release-notes-0.21.0.md

@@ -51,6 +51,12 @@
   DBytes33 (33 bytes) records, preventing malformed TLV data from being
   accepted.
 
+- [Fixed `MarkCoopBroadcasted` to correctly use the `local`
+  parameter](https://github.com/lightningnetwork/lnd/pull/10532). The method was
+  ignoring the `local` parameter and always marking cooperative close
+  transactions as locally initiated, even when they were initiated by the remote
+  peer.
+
 # New Features
 
 - Basic Support for [onion messaging forwarding](https://github.com/lightningnetwork/lnd/pull/9868) 

peer/chan_observer.go

@@ -119,7 +119,12 @@ func (l *chanObserver) DisableOutgoingAdds() error {
 // MarkCoopBroadcasted persistently marks that the channel close transaction
 // has been broadcast.
 func (l *chanObserver) MarkCoopBroadcasted(tx *wire.MsgTx, local bool) error {
-	return l.chanView.MarkCoopBroadcasted(tx, lntypes.Local)
+	party := lntypes.Remote
+	if local {
+		party = lntypes.Local
+	}
+
+	return l.chanView.MarkCoopBroadcasted(tx, party)
 }
 
 // MarkShutdownSent persists the given ShutdownInfo. The existence of the