lnwallet: update GetUtxo to accept the pkScript to comply with new gcs filter

lnwallet/script_utils_test.go

@@ -8,12 +8,12 @@ import (
 	"testing"
 	"time"
 
-	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/btcsuite/btcd/btcec"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
+	"github.com/lightningnetwork/lnd/keychain"
 )
 
 // TestCommitmentSpendValidation test the spendability of both outputs within