[bisq-network/bisq] Fix issue writing json file to disk (#2661)

[Manfred Karrer]

I checked at another class and added some fix there which seems to have been needed on Windows. 
At the end its the same as you suggested but it comes with a comment why as the close is in the finally statment anyway. 
See https://github.com/bisq-network/bisq/pull/2669

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