narrow: drop unnecessary overrides of patch

The patch overrides became unnecessary when I made context.status()
filter by the narrowspec in e411774a2e0f (narrow: move
status-filtering to core and to ctx, 2018-08-02).

Differential Revision: https://phab.mercurial-scm.org/D4823

hgext/narrow/__init__.py

@@ -25,7 +25,6 b' from mercurial import ('
 from . import (
     narrowbundle2,
     narrowcommands,
-    narrowcopies,
     narrowpatch,
     narrowrepo,
     narrowtemplates,
@@ -68,7 +67,6 b' def reposetup(ui, repo):'
 
     if repository.NARROW_REQUIREMENT in repo.requirements:
         narrowrepo.wraprepo(repo)
-        narrowcopies.setup(repo)
         narrowpatch.setup(repo)
         narrowwirepeer.reposetup(repo)