mq: use `revs.sort()` to ensure the set is ascending

Sorting is super-cheap with the new smartset class, so we can use it to enforce
the order. Otherwise all smartset classes would have to allow direct indexing.

hgext/mq.py

@@ -1002,8 +1002,7 class queue(object):
             if not self.applied:
                 raise util.Abort(_('no patches applied'))
             revs = scmutil.revrange(repo, opts.get('rev'))
-            if len(revs) > 1 and revs[0] > revs[1]:
-                revs.reverse()
+            revs.sort()
             revpatches = self._revpatches(repo, revs)
             realpatches += revpatches
             numrevs = len(revpatches)