match: remove ispartial()
The function was added in d1d69ca78883 (match: add match.ispartial(),
2015-05-15) for use by narrowhg, but narrowhg never ended up needing
it.
# See http://EditorConfig.org for the specificationroot = true[*.py]indent_size = 4indent_style = spacetrim_trailing_whitespace = true[*.{c,h}]indent_size = 8indent_style = tabtrim_trailing_whitespace = true