py3: add back a progress(0) call lost in 8664231b47ac
I don't think it really matters, but it wasn't intentional, so let's
just restore the old behavior.
--- a/hgext3rd/evolve/stablesort.py Fri Aug 02 13:00:11 2019 -0700
+++ b/hgext3rd/evolve/stablesort.py Wed Jul 31 10:52:14 2019 -0700
@@ -583,6 +583,7 @@
compat.progress(repo.ui, 'updating stablesort cache',
pos, revstr, unit='revision', total=total)
+ progress(0)
for idx, rev in enumerate(data):
parents = filterparents(repo.changelog.parentrevs(rev))
if len(parents) <= 1: