lnwallet+contractcourt: remove redundant ChanPoint field

lnwallet/channel.go

@@ -1260,9 +1260,6 @@ type LightningChannel struct {
 
 	isClosed bool
 
-	// ChanPoint is the funding outpoint of this channel.
-	ChanPoint *wire.OutPoint
-
 	// sigPool is a pool of workers that are capable of signing and
 	// validating signatures in parallel. This is utilized as an
 	// optimization to void serially signing or validating the HTLC
@@ -1412,7 +1409,6 @@ func NewLightningChannel(signer input.Signer,
 		commitBuilder:        NewCommitmentBuilder(state),
 		localUpdateLog:       localUpdateLog,
 		remoteUpdateLog:      remoteUpdateLog,
-		ChanPoint:            &state.FundingOutpoint,
 		Capacity:             state.Capacity,
 		taprootNonceProducer: taprootNonceProducer,
 		log:                  build.NewPrefixLog(logPrefix, walletLog),

lnwallet/transactions_test.go

@@ -269,7 +269,7 @@ func addTestHtlcs(t *testing.T, remote, local *LightningChannel,
 		hash160map[hash160] = preimage
 
 		// Add htlc to the channel.
-		chanID := lnwire.NewChanIDFromOutPoint(remote.ChanPoint)
+		chanID := lnwire.NewChanIDFromOutPoint(remote.ChannelPoint())
 
 		msg := &lnwire.UpdateAddHTLC{
 			Amount:      htlc.amount,