[bisq-network/bisq] PaymentAccount object removal from ObservableSet issue (#3572)

[chimp1984]

After further investigation it seems that ObservableSet behaves weird. If you copy the ObservableSet entries into a HashSet you can remove it.

```
   public void removePaymentAccount(PaymentAccount paymentAccount) {
        HashSet<PaymentAccount> temp = new HashSet<>(paymentAccountsAsObservable);
        boolean changed = temp.remove(paymentAccount);
        paymentAccountsAsObservable.clear();
        paymentAccountsAsObservable.addAll(temp);
        if (changed)
            persist();
    }
```

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