py3: add b'' prefixes in tests/test-bdiff.py
This makes the test close to passing
# skip-blame because just b'' prefixes
Differential Revision: https://phab.mercurial-scm.org/D4695
BasedOnStyle: LLVM
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UseTab: ForIndentation
BreakBeforeBraces: Linux
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IndentCaseLabels: false
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IncludeCategories:
- Regex: '^<'
Priority: 1
- Regex: '^"'
Priority: 2