[Toybox] [PATCH] tests: fix for empty /etc/passwd or /etc/group.

[enh]

It turns out some Android devices have an empty /etc/passwd and/or
/etc/group, which was defeating the previous workaround. Switch to
testing the intention more directly: we'll try the file in /etc, and if
that didn't work, we'll assume we need a workaround.
---
 tests/chgrp.test | 11 ++++-------
 tests/chown.test | 17 +++++++----------
 2 files changed, 11 insertions(+), 17 deletions(-)
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