PhoneNumberValidityChangeListener not called when navigate back

When navigate to another Fragment and then go back to phone Country Code selector fragment, not working phone formatter and phoneNumberValidatorChangeListener aren't call ever.

Set both on onViewCreated method:

```
layoutMobileFields.etPhoneCountryCode.setPhoneNumberValidityChangeListener
layoutMobileFields.etPhoneCountryCode.registerCarrierNumberEditText(layoutMobileFields.etPhoneNumber as EditText)
```

Start with the Fragment's onViewCreated method and the two listener and registration calls shown in the issue. Reproduce navigating away from and back to the phone Country Code selector, then verify that phone formatting and phoneNumberValidityChangeListener callbacks work after returning.

Escrita pelo modelo de indexação a partir do texto da issue.