tox.ini: Remove no more needed pipfpaf use
Tests can be run without using pifpaf nowadays so remove its use by tox.
Migrated from D4558 (view on Phabricator)
Staging instance, all changes can be removed at any time
Tests can be run without using pifpaf nowadays so remove its use by tox.
Migrated from D4558 (view on Phabricator)