win32text: drop the `changing_parents` context in revert upgrade

We are not changing parents here, so let us not pretend we do.

hgext/win32text.py

@@ -216,7 +216,6 def reposetup(ui, repo):
 def wrap_revert(orig, repo, ctx, names, uipathfn, actions, *args, **kwargs):
     # reset dirstate cache for file we touch
     ds = repo.dirstate
-    with ds.changing_parents(repo):
         for filename in actions[b'revert'][0]:
             entry = ds.get_entry(filename)
             if entry is not None: