message: txbuilder: remove unused y var
diff: @@ -165,7 +165,7 @@ function fixMultisigOrder (input, transaction, vin) {
  var unmatched = input.signatures.concat()
  - input.signatures = input.pubKeys.map(function (pubKey, y) {
  + input.signatures = input.pubKeys.map(function (pubKey) {
  var keyPair = ECPair.fromPublicKeyBuffer(pubKey)
  var match
  