ls: Fix -v and associated test

The cleanup of d854370fa86b7 had a cut and paste error (so f_verssort
was set to 1 and then to 0 rather thame f_timesort being set to 0).

Fixes: d854370fa86b7
Sponsored by: Netflix

(cherry picked from commit ef75877fc2d93199aab2b509089136c433af1f20)