update tzsetup for libbsddialog 0.0.1

[asiciliano]

Summary

Update tzsetup with libbsddialog 0.0.1

libbsdialog 0.0.1 provides:

• bsddialog_conf.auto_minwidth
• menurows is variable with autosize (properly defines max menurows)

Then tzsetup can use BSDDIALOG_AUTOSIZE keeping the dialog behavior: min 24 cols, max 16 menurows.