A user reported to me that they are unable to create a PSBT with a legacy watchonly wallet when they use the GUI. They get an error "The amount exceeds your balance".

I think the issue is that the GUI will retrieve the wallet's balance via `AvailableCoins` before calling `CreateTransaction`. This call to `AvailableCoins` is resulting in fewer coins being returned with recent changes to how `AvailableCoins` works, particularly with additional filtering of spendable coins and preset coins.

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Note that this does not effect descriptor wallets. A workaround for this issue is to switch to using descriptor wallets. An existing legacy wallet can be turned into a descriptor wallet using the `migratewallet` RPC. However many watchonly legacy wallets are likely the result of importing descriptors via `importmulti`. For such wallets, I recommend creating a new descriptor wallet and re-importing the descriptors.
{
    m_current_transaction.reset();
    // 
    m_coin_control->UnSelectAll();
    ui->checkBoxCoinControlChange->setChecked(false);
    ui->lineEditCoinControlChange->clear();
    coinControlUpdateLabels();
    // 
    while(ui->entries->count())
    {
        ui->entries->takeAt(0)->widget()->deleteLater();
    }
    addEntry();
    updateTabsAndLabels();
}
void SendCoinsDialog::reject()
{
    clear();
}
void SendCoinsDialog::accept()