hgweb: ensure template mapping keys are bytes Before, str keys were being added in Python 3 because named arguments to dict() use native str for keys. This caused the templater to fail to find the keys since it was looking for bytes versions. This makes a handful of tests pass on Python 3. We may want to consider having the templater validate that keys in mapping dicts are bytes. But I'm unsure whether this is appropriate and won't be doing this. Differential Revision: https://phab.mercurial-scm.org/D5666