There's a few small issues left over from #15450:

* [Focusing](https://github.com/bitcoin/bitcoin/pull/15450#pullrequestreview-282297760) on the `Encrypt Wallet` dialog after clicking `Create Wallet`.
> ```cpp
> m_passphrase_dialog->setWindowModality(Qt::ApplicationModal); 
> m_passphrase_dialog->show();
> ```

* Wallet [name escaping issue](https://github.com/bitcoin/bitcoin/pull/15450#pullrequestreview-282297760):
> This is at least one inconsistency where if you create a wallet with a HTML escaped character in the name, i.e Alice & Bob, then the & will not be shown in some menus / dialogs.

* Nits from this [review](https://github.com/bitcoin/bitcoin/pull/15450#pullrequestreview-284450044). 
{
    QMutexLocker locker(&m_mutex);
    
    if (!m_wallets.empty()) {
        std::string name = wallet->getWalletName();
        for (WalletModel* wallet_model : m_wallets) {
            if (wallet_model->wallet().getWalletName() == name) {
                return wallet_model;
            }
        }
    }
    
    WalletModel* wallet_model = new WalletModel(std::move(wallet), m_node, m_platform_style, m_options_model, nullptr);
    
    wallet_model->moveToThread(thread());
    wallet_model->setParent(this);
    m_wallets.push_back(wallet_model);
    connect(wallet_model, &WalletModel::unload, [this, wallet_model] {