news/inn: Fix blocklistd/blacklistd compat

Use Jose's find/sed approach to handle the blocklist rename
across FreeBSD versions. My attepmt was not broad enough.

INN 2.8 source uses "blocklist" so on
FreeBSD < 15.0 we sed it back to "blacklist". INN 2.7 source uses
"blacklist" so on FreeBSD >= 15.0 we sed it to "blocklist".

Co-Authored-By: Jose Luis Duran <jlduran@FreeBSD.org>