[Toybox] [PATCH] ls: fix recent regression.

[enh]

Commit c26870dab3462c6176936384b090df6b9ba46dee broke ls' error
reporting for files that don't exist. `ls $F` is used by some as an
equivalent of `test -e $F`.

This patch also adds a regression test.
---
 tests/ls.test   |  3 +++
 toys/posix/ls.c | 10 +++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)
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