typing: drop an unnecessary warning disabling comment in match.py

This stopped being necessary in d2e1dcd4490d, when the exception stopped being
subscripted.

mercurial/match.py

@@ -368,7 +368,7 b' def _donormalize(patterns, default, root'
                     % (
                         pat,
                         inst.message,
-                    )  # pytype: disable=unsupported-operands
+                    )
                 )
             except IOError as inst:
                 if warn: