fortune/freebsd-tips: Remove bogus fortune

The RCS IDs have been retired as of the move to git, so on 14-CURRENT
and 13.0-STABLE this fortune returns the following.

This fortune brought to you by:
$FreeBSD$

While faintly amusing the first time, this might just cause confusion
for folks, and in addition it's not the most useful of tips, so doesn't
add much.

Therefore it seems prudent to get rid of it.

MFC: Not to 11-STABLE or 12-STABLE.