[bisq-network/bisq] Fix NPE when editing same bank account name (PR #6167)

[Christoph Atteneder]

@ripcurlx requested changes on this pull request.

NACK - Still broken when switching back to not use a custom account name

![Bildschirmfoto 2022-04-26 um 11 00 07](https://user-images.githubusercontent.com/170962/165263562-eabc2caa-59e7-4694-a67e-8ac0fb21df55.png)

```
Apr.-26 11:00:03.709 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Uncaught Exception from thread JavaFX Application Thread 
Apr.-26 11:00:03.709 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableMessage= Cannot invoke "bisq.desktop.components.InputTextField.getText()" because "this.bankIdInputTextField" is null 
Apr.-26 11:00:03.709 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: throwableClass= class java.lang.NullPointerException 
Apr.-26 11:00:03.709 [JavaFX Application Thread] ERROR bisq.common.setup.CommonSetup: Stack trace:
java.lang.NullPointerException: Cannot invoke "bisq.desktop.components.InputTextField.getText()" because "this.bankIdInputTextField" is null
	at bisq.desktop.components.paymentmethods.GeneralBankForm.autoFillAccountTextFields(GeneralBankForm.java:145)
	at bisq.desktop.components.paymentmethods.BankForm.autoFillNameTextField(BankForm.java:401)
	at bisq.desktop.components.paymentmethods.PaymentMethodForm.lambda$addAccountNameTextFieldWithAutoFillToggleButton$2(PaymentMethodForm.java:144)
```




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