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

[Yuya Nishihara]

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::?