[bisq-network/bisq] Add backward compatibility for revolut change (#4481)

[Christoph Atteneder]

@ripcurlx commented on this pull request.



> +    public void setUserName(String userName) {
+        this.userName = userName;
+        // We need to set accountId as pre v1.3.8 clients expect the accountId field
+        if (accountId.isEmpty()) {
+            accountId = userName;
+        }

I just tried to create a new Revolut account and saw that it doesn't behave as expected.

![Bildschirmfoto 2020-09-09 um 16 12 09](https://user-images.githubusercontent.com/170962/92611346-fb2a9e80-f2b8-11ea-95b4-dd9e2dcaef61.png)
![Bildschirmfoto 2020-09-09 um 16 13 35](https://user-images.githubusercontent.com/170962/92611362-fe258f00-f2b8-11ea-8622-50f92e1dfe87.png)

The problem is that it is checked at this place if the accountId is empty which will only work for the first character entered into the field e.g. `B` of `Bobby` this ends up with `accountId` set to `B` and userName set to `Bobby`

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