.clang-format

py3: stop normalizing .encode()/.decode() arguments to unicode

Now that we don't byte transform string literals, we no longer need
this transform.

While we're here, we also drop some superfluous u'' prefix in existing
callers.

Differential Revision: https://phab.mercurial-scm.org/D7011

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IncludeCategories:
  - Regex:           '^<'
    Priority:        1
  - Regex:           '^"'
    Priority:        2