message: Fix variable shadowing in qt/paymentserver.cpp
  qt/paymentserver.cpp:838:51: warning: declaration shadows a field of 'PaymentServer' [-Wshadow]
  void PaymentServer::setOptionsModel(OptionsModel *optionsModel) { this->optionsModel = optionsModel; }
  ^
  ./qt/paymentserver.h:153:19: note: previous declaration is here
  OptionsModel *optionsModel;
  ^
diff: @@ -835,7 +835,7 @@ void PaymentServer::reportSslErrors(QNetworkReply *reply, const QList<QSslError>
  Q_EMIT message(tr("Network request error"), errString, CClientUIInterface::MSG_ERROR);
  }
  -void PaymentServer::setOptionsModel(OptionsModel *optionsModel) { this->optionsModel = optionsModel; }
  +void PaymentServer::setOptionsModel(OptionsModel *_optionsModel) { this->optionsModel = _optionsModel; }
  void PaymentServer::handlePaymentACK(const QString &paymentACKMsg)
  {
  // currently we don't further process or store the paymentACK message
  