Update Java2TypeScriptTranslator.java

[mueller-jens]

Correction of if statement generation issue #573

[lgrignon]

That's nice, thank you very much.
Could you please point at JSweet3.0-moduleinfo branch instead of JSweet3.0
and provide a unit test to show the issue :)

We will merge it right away.

Thanks again.

[mueller-jens]

Hi @lgrignon i have created a pull request for both branches because i have no idea wich was the right one, I wil try create a unit test and come backt o you asap