py3: handle keyword arguments correctly in hgext/acl.py

The keys of keyword arguments on python 3 should be str, so when we try to get
some key from them, we must make sure we are using str.

# skip-blame because just b'' prefix

Differential Revision: https://phab.mercurial-scm.org/D4455

hgext/acl.py

@@ -375,9 +375,9 b' def hook(ui, repo, hooktype, node=None, '
         _txnhook(ui, repo, hooktype, node, source, user, **kwargs)
 
 def _pkhook(ui, repo, hooktype, node, source, user, **kwargs):
-    if kwargs['namespace'] == 'bookmarks':
-        bookmark = kwargs['key']
-        ctx = kwargs['new']
+    if kwargs[r'namespace'] == 'bookmarks':
+        bookmark = kwargs[r'key']
+        ctx = kwargs[r'new']
         allowbookmarks = buildmatch(ui, None, user, 'acl.allow.bookmarks')
         denybookmarks = buildmatch(ui, None, user, 'acl.deny.bookmarks')