message: Add condition to check signature only if exodus message version is v1
diff: @@ -164,6 +164,7 @@ int TxProcessor::ProcessSimpleSpend(const CMPTransaction& tx)
  assert(spend);
  // check signature
  + if (version == MP_TX_PKT_V1) {
  CBitcoinAddress receiver(tx.getReceiver());
  int64_t referenceAmount = tx.getReferenceAmount().value_or(0);
  auto &publicKey = tx.getSigmaECDSAPublicKey();
  @@ -178,6 +179,7 @@ int TxProcessor::ProcessSimpleSpend(const CMPTransaction& tx)
  PrintToLog("%s(): rejected: signature is invalid\n", __func__);
  return PKT_ERROR_SIGMA - 907;
  }
  + }
  // check serial in database
  uint256 spendTx;
  