narrowbundle2: this dict contains native strings, look kws up as such

We could also do a byteskwargs dance, but that seems silly given that
we only need this one element.

Differential Revision: https://phab.mercurial-scm.org/D2368

hgext/narrow/narrowbundle2.py

@@ -479,7 +479,7 b' def setup():'
         if repo.ui.has_section(_NARROWACL_SECTION):
             getbundlechangegrouppart_narrow(
                 *args, **applyacl_narrow(repo, kwargs))
-        elif kwargs.get('narrow', False):
+        elif kwargs.get(r'narrow', False):
             getbundlechangegrouppart_narrow(*args, **kwargs)
         else:
             origcgfn(*args, **kwargs)