[bisq-network/bisq] Specify Amazon eGift Card country (#5117)

[jmacxx]

### Testing summary:


**Check that old Bisq can trade with new Bisq.**

- Run two instances, 1.5.4 (old) and this PR (new) Bisq.  Set up Amazon EUR accounts in each.
- In old Bisq, create one Buy and one Sell offer.
- In new Bisq, create one Buy and one Sell offer.
- Take all offers from each side, resulting in 4 trades.
- Generate/wait for a blockchain confirmation.
- Note that when trading with an old counterparty they do not provide the country information, so it will be blank.
- Initiate payment on each trade and verify that the counterparty screen looks good.
- Mark payment accepted on each trade and complete the trades.
 
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**Check that account upgrade works for each possible currency:**

- Using old Bisq version (1.5.4), create 11 AmazonGiftCard accounts, one for each currency: 
- EUR, AUD, CAD, GBP, INR, JPY, SAR, SEK, SGD, TRY, USD.
- Close the app, upgrade to this PR (new) Bisq.
- Start up the app and verify that all the accounts are upgraded.  In the case of EUR, verify that you are prompted to choose the Eurozone country for that account.
 
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**Check that new Bisq can trade with new Bisq.**

Same procedure as first test, but with both instances running this PR (new) Bisq.


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