tests: update output for test-check-pylint.t...
tests: update output for test-check-pylint.t
The py3 version on Windows appends "(previous run: 10.00/10, +0.00)" with py39.
I didn't see that for the exact same version on Linux (with py3.6.9).
Differential Revision:
https://phab.mercurial-scm.org/D9536