[PATCH] tests: use `pwd` instead of $PWD

[Augie Fackler]

> On Jul 6, 2020, at 7:29 AM, Yuya Nishihara <yuya at tcha.org> wrote:
> 
> On Sat, 04 Jul 2020 16:26:04 +0200, Manuel Jacob wrote:
>> More tests are broken:
>> 
>> * 
>> https://buildbot.mercurial-scm.org/builders/hg%20tests/builds/2975/steps/run-tests.py%20%28python%202.7.10%29/logs/stdio
>> * https://foss.heptapod.net/octobus/mercurial-devel/-/jobs/82924
>> 
>> Since both are still draft, we could also temporarily prune afecc7f76f2d 
>> and 3707f6e7e04e, which seem to be the cause of the failure.
> 
> I've rebased the other patch onto afecc7f76f2d^.
> 
> Augie, can you rebase or prune afecc7f76f2d::?

Done.