Remove useless exit code information

Current launcher shows exit code when game crashed with non-zero exit code.

But normally, this code doesn't have any information about crash and be 1, -1 or any random trash number.

This makes some non-professional users to search or ask help with only non-useful exit code and troubleshooting harder.

So, I suggest to remove it and don't show anything about exit code or just say "non-zero exit code" instead of real code (might keep exit code on log will better)