periodic: remove obsolete news.expire

With the initial import of 386BSD 0.1 in 1993, the daily execution of
/etc/news.expire was introduced (see commit 1bf9d5d9518e).

In 1997, this was brought into periodic resulting in daily/330.news
(see commit 28dce04d1975). But as far as I see, /etc/news.expire has
never existed.

PR: 256238
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D30631