[Toybox] [PATCH] lsattr.test: clean up and fix.

[enh]

My previous attempt to fix this worked for ext-with-extents on the
desktop, but not for f2fs-with-encryption on cloud Android devices.

This feels quite a bit cleaner, and has the benefit of actually working
everywhere I've tried it.

I've also added perfunctory testing of -p too, which was missing before.
---
 tests/lsattr.test | 45 +++++++++++++++++++++++++++------------------
 1 file changed, 27 insertions(+), 18 deletions(-)
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