[Decompiler] vineflower-server prints "failed to kill subprocess" error message when subprocess is killed

I have only encountered this error on windows, but it prints the below error message even when the `vineflower-server.jar` sub-process is successfully killed.

```console
ERR Failed to kill subprocess C:/<user_path>/marv/lib/vineflower-server.jar error="TerminateProcess: Access is denied."
```