The part of the GUI that this setting is relevant for does not exist in a `--disable-wallet` build. 

![wallet_prefs](https://user-images.githubusercontent.com/863730/70331435-72547300-180d-11ea-842d-82f8529ae982.png)
{
    ui->okButton->setEnabled(fState);
}
void OptionsDialog::on_resetButton_clicked()
{
    if(model)
    {
        
        QMessageBox::StandardButton btnRetVal = QMessageBox::question(this, tr("Confirm options reset"),
            tr("Client restart required to activate changes.") + "<br><br>" + tr("Client will be shut down. Do you want to proceed?"),
            QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Cancel);
        if(btnRetVal == QMessageBox::Cancel)
            return;
        
        model->Reset();
        QApplication::quit();
    }
}
void OptionsDialog::on_openBitcoinConfButton_clicked()
{
    
    QMessageBox::information(this, tr("Configuration options"),
        tr("The configuration file is used to specify advanced user options which override GUI settings. "
           "Additionally, any command-line options will override this configuration file."));
    
    if (!GUIUtil::openBitcoinConf())
        QMessageBox::critical(this, tr("Error"), tr("The configuration file could not be opened."));
}
void OptionsDialog::on_okButton_clicked()