AttributeError: 'SlippstreamClient' object has no attribute 'server'

[tejashah88]

When trying to stop the Dolphin console via the .stop() method, there seems to be an attribute error coming from an uninitialized variable.

Traceback (most recent call last):
  File "<redacted>", line 110, in cleanup
    console.stop()
  File "<redacted>/env/lib/python3.10/site-packages/melee/console.py", line 293, in stop
    self._slippstream.shutdown()
  File "<redacted>/env/lib/python3.10/site-packages/melee/slippstream.py", line 71, in shutdown
    self.server.close()
AttributeError: 'SlippstreamClient' object has no attribute 'server'

Upon closer inspection of SlippstreamClient, I noticed that there's a gamecube flag, which is used within the Console class (here). However strangely, it seems that the logic is swapped, where if the system property is set to "dolphin", then the gamecube flag is set to True and vice versa. I'm not sure if this is intended or if swapping the logic will work but it seems to be the obvious (but not necessarily correct) fix.

This fix should also allow Dolphin to be properly shutdown and the temporary directory to be removed if set.