tests/test-ui-color.py.out

tests: remove unnecessary explicit args from `failfilemerge.py`

The `failfilemerge()` function always raises an exception without
looking at its arguments, so let's use `*args` and `**kwargs`.

Differential Revision: https://phab.mercurial-scm.org/D11854

warning
error
b'buffered\n'
colored? True
colored? True