[Toybox] [PATCH] ls: fix -Z, add a test.

[enh]

This broke a netd test (but sadly in postsubmit rather than presubmit).

Also add a trivial test that would at least have caught this bug.

Bug: http://b/140453237
---
 tests/ls.test   | 1 +
 toys/posix/ls.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
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