tests: stabilize test-log.t on Windows
I think this is because Windows doesn't recognize single quote. Other ssh based
clones use this clunky style too.
Differential Revision: https://phab.mercurial-scm.org/D8459
tests: stabilize test-convert-hg-source.t on Windows
This was a missing update in 1b8fd4af3318.
Differential Revision: https://phab.mercurial-scm.org/D8458