tests: port test-ui-color.py to Python 3
As in some other tests, I like confirming that we're dealing with
bytes here, so the b prefix is now in the expected output on both 2
and 3.
Differential Revision: https://phab.mercurial-scm.org/D3512
# See http://EditorConfig.org for the specification
root = true
[*.py]
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indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true