bsdinstall: Fix newfs bsddialog menu

The second and third members of struct bsddialog_menuitem are bool on
and unsigned int depth. The newfs dialog options in bsdinstall's
partition tool had these two swapped, so the default selection did not
work.

PR: 290857
Reviewed by: asiciliano
Fixes: 50e244964e9b ("bsdinstall/partedit: Replace libdialog with libbsddialog")
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D53639