lnwallet: check for correct value in HTLC outputs in commitment transaction

It is possible that that there are multiple HTLCs with different values,
but the same public key script. As such, a check against the value should
be performed when looking for HTLC outputs in a commitment transaction.

lnwallet/channel.go

@@ -276,7 +276,8 @@ func (c *commitment) toChannelDelta(ourCommit bool) (*channeldb.ChannelDelta, er
 			pkScript = p.ourPkScript
 		}
 		for i, txOut := range c.txn.TxOut {
-			if bytes.Equal(txOut.PkScript, pkScript) {
+			if bytes.Equal(txOut.PkScript, pkScript) &&
+				txOut.Value == int64(p.Amount) {
 				if contains(dups[p.RHash], uint16(i)) {
 					continue
 				}