Summary

1. On unknown commands just return a fine data push, fixes the OS/2 built-in MKE cdrom driver being unrecognized.
2. Okay, but I don't know if it's right, but don't play audio on the seek command, fixes actual audio stop when prompted to, (Audio still works fine if you actually want to play from a CD player).

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.