bsddialog: Correct type for bsddialog_total_progview

It was an int, but printed with %lli format. Although it would be
reasonable to use a 32-bit int here (i.e., changing the printf format
instead) this matches what was done in bsddialog upstream (and now in
main).

PR: 286655
Reviewed by: asiciliano
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D50261