Opening two of the same wallet (tested in v0.18.0 of bitcoin-qt 64 bit) will cause a database collision, and will crash the program.

`[marshall@likon] {21:21} [~] $ bitcoin-0.18.0/bin/bitcoin-qt `
`terminate called after throwing an instance of 'std::runtime_error'  what():  BerkeleyBatch: Can't open database 8204388-wallet.dat (duplicates fileid 8b1c090000000800e25686350000000000000000 from 1352491-wallet.dat)`
`Aborted (core dumped)`

I have been able to reproduce the issue by importing two of the same wallet (with different filenames).
: QObject(wallet_controller)
    , m_wallet_controller(wallet_controller)
    , m_parent_widget(parent_widget)
{
}
WalletControllerActivity::~WalletControllerActivity()
{
    delete m_progress_dialog;
}
void WalletControllerActivity::showProgressDialog(const QString& label_text)
{
    m_progress_dialog = new QProgressDialog(m_parent_widget);
    m_progress_dialog->setLabelText(label_text);
    m_progress_dialog->setRange(0, 0);
    m_progress_dialog->setCancelButton(nullptr);
    m_progress_dialog->setWindowModality(Qt::ApplicationModal);
    GUIUtil::PolishProgressDialog(m_progress_dialog);
}
CreateWalletActivity::CreateWalletActivity(WalletController* wallet_controller, QWidget* parent_widget)