pathauditor: drop a redundant call to bytes.lower()
`_lowerclean(s)` calls `s.lower()`, so we don't need to do that before
calling it.
Differential Revision: https://phab.mercurial-scm.org/D8001
# See http://EditorConfig.org for the specification
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[*.py]
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[*.{c,h}]
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indent_style = tab
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[*.t]
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trim_trailing_whitespace = false