tzsetup: be explicit about *timezone* abbreviation

[emaste]

Summary

During the install process tzsetup asks a question like

Does the abbreviation `EDT' look reasonable?

The installer asks lots of questions, some that relate to the previous
screen or topic and some that do not. A new user installed FreeBSD for
the first time and was confused by this question, not realizing that it
was asking whether the abbreviation is correct for the selected
timezone.

[brooks]

Seems reasonable.

I'm not entirely convinced this dialog should exist at all... Can we really not trust the user to select something from a list? Especially since the consequences of getting it wrong are pretty minor...

[emaste]

I'm not entirely convinced this dialog should exist at all...

Good point, I think we could just eliminate it (and might take a look at that in the context of more significant installer & related rework). I'll make just this small change for now though for 13 and 14, so that installer screenshots and instructions continue to largely match.

[imp]

Agnostic on it's existence... maybe lean for removing it