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

[jmacxx]

@chimp1984 I don't know how to make this change compatible with prior versions.

When both clients are new:
- Alice creates an offer to sell BTC for Amazon.
- Bob takes the offer and is instructed to buy the Amazon GC from Alice's **country of residence**.

Here's the problem:
- Alice is running **old** Bisq (1.5.4) and creates an offer to sell BTC for Amazon.  Her account does not include country.
- Bob is running new Bisq version that includes this feature.
- Bob takes the offer, but gets a failed trade because Alice (old version) did not supply the country in the contract -> `An error occurred at task: TakerVerifyAndSignContract Contracts are not matching`

What's the best way to resolve this?

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