[bisq-network/bisq] Supported currencies not validated when creating new Advanced Cash account (#3699)

[Julian Knutsen]

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### Description

No validation for Advanced Cash `Supported currencies`

#### Version

548a21775

### Steps to reproduce

1. Create new account 'Advanced Cash'
2. Type in valid Wallet ID
3. Uncheck supported currencies

### Expected behaviour

Validation error around needing to specify at least 1 supported currency

### Actual behavior

No red validation errors for anything, but `Save New Account` is grey. Multiple user input fields makes it harder to understand where the error originated.

### Screenshots

![supported_currency_validation](https://user-images.githubusercontent.com/8082291/69750452-adfe8700-1101-11ea-82d7-f5abfb5542b6.JPG)

#### Device or machine

Ubuntu 19.10

#### Additional info

Likely an issue across all accounts. Not super high priority, but helping users help themselves will limit unnecessary bug reports in the future.


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https://github.com/bisq-network/bisq/issues/3699
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