security/py-fail2ban: Remove unneeded filter.d files

There is some confusion whether to use the sshd.conf, bsd-sshd.conf.
or the bsd-sshd-session.conf filters. bsd-sshd-session.conf is the
correct and only filter to use on FreeBSD systems. Using the others
will result in incorrect operation on a FreeBSD system with a supported
sshd installed.

PR: 288849