inetd.conf: remove -[46] from the ssh entry

sshd doesn't require these flags, and including them makes outgoing
connections (e.g., port forwarding) restricted to the family of the
inbound connection, which is not usually desirable and also not how
standalone sshd works.

MFC after: 3 days
Reviewed by: kevans
Approved by: kevans (mentor)
Differential Revision: https://reviews.freebsd.org/D51296

(cherry picked from commit 6738882248a755aad859784150969085e006cf89)