message: [Qt] Fix zPIV spend's nCount
  Actually increment `nCount` in the loop when displaying the transaction
  details so it doesn't stay at `0`.
diff: @@ -484,6 +484,7 @@ void PrivacyDialog::sendzPIV()
  strStats += tr("serial: ") + spend.GetSerial().ToString().c_str() + "\n";
  strStats += tr("Spend is 1 of : ") + QString::number(spend.GetMintCount()) + " mints in the accumulator\n";
  nValueIn += libzerocoin::ZerocoinDenominationToAmount(spend.GetDenomination());
  + ++nCount;
  }
  CAmount nValueOut = 0;
  