Clean out freeciv-2.7 options file slot
We were prepared for the chance that we still release 2.7 before 3.0, and the S3_0+ client does check for 2.7 options file to fallback to if no newer one is found. Clean that out.
We were prepared for the chance that we still release 2.7 before 3.0, and the S3_0+ client does check for 2.7 options file to fallback to if no newer one is found. Clean that out.