py3: use '%d' for rev nums instead of '%s'

This makes test-close-head.t pass on Python 3.

Differential Revision: https://phab.mercurial-scm.org/D5040

contrib/python3-whitelist

@@ -71,6 +71,7 b' test-clone-uncompressed.t'
 test-clone-update-order.t
 test-clone.t
 test-clonebundles.t
+test-close-head.t
 test-commit-amend.t
 test-commit-interactive.t
 test-commit-multiple.t

hgext/closehead.py

@@ -66,7 +66,7 b' def close_branch(ui, repo, *revs, **opts'
     heads = set(repo[h].rev() for h in heads)
     for rev in revs:
         if rev not in heads:
-            raise error.Abort(_('revision is not an open head: %s') % rev)
+            raise error.Abort(_('revision is not an open head: %d') % rev)
 
     message = cmdutil.logmessage(ui, opts)
     if not message: