sysutils/mkjail: Update to 0.0.5

re: https://github.com/mkjail/mkjail/releases/tag/0.0.5

This release lets you specify zpool for /var/db/mkjail

While here, fix maintainer. I set it as fuz when I first created the
port in 2021 - I'm sure that was a copy/paste error.

Fixes: 175e9e5f When port was created, maintainer was wrong