ssh: update FREEBSD-upgrade for upstream CheckHostIP default change

We changed the CheckHostIP default to "no" years ago. Upstream has now
made the same change, so do not list it as a local change any longer.

I did not just remove the "Modified client-side defaults" section to
avoid having to renumber everything, and we may add a new local change
in the future.

Sponsored by: The FreeBSD Foundation