message: fix old witness structure
diff: @@ -28,7 +28,7 @@ pub enum Error {
  UtxoValueNotMatching(Value, Value),
  UtxoError(utxo::Error),
  UtxoInvalidSignature(UtxoPointer, Output<Address>, Witness),
  - OldUtxoInvalidSignature(UtxoPointer, Output<OldAddress>, Witness),
  + OldUtxoInvalidSignature(UtxoPointer, Output<legacy::OldAddress>, Witness),
  AccountInvalidSignature(account::Identifier, Witness),
  UtxoInputsTotal(ValueError),
  UtxoOutputsTotal(ValueError),
  