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

[Manfred Karrer]

ManfredKarrer commented on this pull request.

NACK

> @@ -78,6 +78,7 @@ public void writeToDisc(String json, String fileName) {
 
                 printWriter = new PrintWriter(tempFile);
                 printWriter.println(json);
+                printWriter.close();

It is in the finally statement:
```
if (printWriter != null)
                    printWriter.close();
```

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