multi: use txid instead of tx in BreachRetribution

This commit replaces the field `BreachTransaction` with `BreachTxHash`
as there's no need to pass that large raw transaction.

contractcourt/breacharbiter.go

@@ -1243,7 +1243,7 @@ func newRetributionInfo(chanPoint *wire.OutPoint,
 	}
 
 	return &retributionInfo{
-		commitHash:      breachInfo.BreachTransaction.TxHash(),
+		commitHash:      breachInfo.BreachTxHash,
 		chainHash:       breachInfo.ChainHash,
 		chanPoint:       *chanPoint,
 		breachedOutputs: breachedOutputs,

contractcourt/breacharbiter_test.go

@@ -1051,7 +1051,7 @@ func TestBreachHandoffSuccess(t *testing.T) {
 			processACK <- brarErr
 		},
 		BreachRetribution: &lnwallet.BreachRetribution{
-			BreachTransaction: bobClose.CloseTx,
+			BreachTxHash: bobClose.CloseTx.TxHash(),
 			LocalOutputSignDesc: &input.SignDescriptor{
 				Output: &wire.TxOut{
 					PkScript: breachKeys[0],
@@ -1085,7 +1085,7 @@ func TestBreachHandoffSuccess(t *testing.T) {
 			processACK <- brarErr
 		},
 		BreachRetribution: &lnwallet.BreachRetribution{
-			BreachTransaction: bobClose.CloseTx,
+			BreachTxHash: bobClose.CloseTx.TxHash(),
 			LocalOutputSignDesc: &input.SignDescriptor{
 				Output: &wire.TxOut{
 					PkScript: breachKeys[0],
@@ -1137,7 +1137,7 @@ func TestBreachHandoffFail(t *testing.T) {
 			processACK <- brarErr
 		},
 		BreachRetribution: &lnwallet.BreachRetribution{
-			BreachTransaction: bobClose.CloseTx,
+			BreachTxHash: bobClose.CloseTx.TxHash(),
 			LocalOutputSignDesc: &input.SignDescriptor{
 				Output: &wire.TxOut{
 					PkScript: breachKeys[0],
@@ -1179,7 +1179,7 @@ func TestBreachHandoffFail(t *testing.T) {
 			processACK <- brarErr
 		},
 		BreachRetribution: &lnwallet.BreachRetribution{
-			BreachTransaction: bobClose.CloseTx,
+			BreachTxHash: bobClose.CloseTx.TxHash(),
 			LocalOutputSignDesc: &input.SignDescriptor{
 				Output: &wire.TxOut{
 					PkScript: breachKeys[0],

contractcourt/chain_watcher.go

@@ -812,7 +812,7 @@ func (c *chainWatcher) handlePossibleBreach(commitSpend *chainntnfs.SpendDetail,
 	// own broadcasted state we are looking at. Therefore check that the
 	// commit matches before assuming it was a breach.
 	commitHash := commitSpend.SpendingTx.TxHash()
-	if retribution.BreachTransaction.TxHash() != commitHash {
+	if retribution.BreachTxHash != commitHash {
 		return false, nil
 	}