net/akhq: misc fix
- Fix handling of sample file
- Fix PREFIX vs LOCALBASE in the .in file
- Fix NO_EXTRACT and CONFIG_FILES that are not needed anymore
Sponsored by: Klara, Inc.
Approved by: 0mp (mentor)
Approved by: kevans
Reported by: diizzy
Differential Revision: https://reviews.freebsd.org/D49537