[bisq-network/bisq] Change Western Union Payment Method to be Multi-Currency (#5498)

[pazza]

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### Description

Western Union supports multiple currencies.

Currently when adding Western Union as a payment method to Bisq it requires you to select only one currency.

Sending payments to people in multiple other currencies is what Western Union is for.

The Western Union payment method in Bisq should be updated to included ALL currencies, barring the ones listed below.

#### Version

1.6.4

### Steps to reproduce

Go to Accounts > National Currency Accounts

Select Add New Account, choose Western Union

You will be required to select only one currency.

### Expected behaviour

Go to Accounts > National Currency Accounts

Select Add New Account, choose Western Union

You will be required to select out of all currencies available.
 
### Screenshots

This is how it currently is:

![WU](https://user-images.githubusercontent.com/66367547/118415361-c5d51c80-b6a1-11eb-9f14-19c19e63e82d.png)

You should have the option to select multiple currencies from a list of all currencies available in Bisq. The only currencies NOT supported by Western Union are as follows:

- Iran (IRN)
- North Korea (PRK)
- Syria (SYR) 
- Sudan (SDN)
- Cuba (CUB) 

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https://github.com/bisq-network/bisq/issues/5498
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