tests: restore Python 3 compat in test-parseindex2.py
I think this was previously getting lucky in Python 3, and would have
stacktraced if something failed. Now that failure messages are eagerly
computed, this turned into a problem.
Differential Revision: https://phab.mercurial-scm.org/D4182
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false