demandimport: remove an obsolete comment about importing from future
See
6000f5b25c9b.
--- a/hgdemandimport/demandimportpy3.py Wed Oct 19 11:10:54 2022 -0400
+++ b/hgdemandimport/demandimportpy3.py Mon Oct 31 16:36:00 2022 +0400
@@ -23,8 +23,6 @@
enabled.
"""
-# This line is unnecessary, but it satisfies test-check-py3-compat.t.
-
import contextlib
import importlib.util
import sys