[Toybox] [PATCH] chattr.test: fix tests.

[enh]

Cope with all the extra flags added recently, and ignore random stuff
from the environment like extents and encryption.

Tested on a cloud Android emulator with f2fs.
---
 tests/chattr.test | 142 +++++++++++++++++++++++++++-------------------
 1 file changed, 85 insertions(+), 57 deletions(-)
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