procutil: use rapply(tonativestr, ...) to preserve lists when they come in
This was broken when script was a list instead of a string. I caught this
with an internal extension at Google, and I'm not really sure why it wasn't
caught in any kind of CI.
Differential Revision: https://phab.mercurial-scm.org/D9471
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true