[Toybox] [PATCH] ls.c: match coreutils exit status.

[enh]

Andrew Ilijic noticed that our ls exit status differs from coreutils
while writing tests. From coreutils' `ls --help`:

 0  if OK,
 1  if minor problems (e.g., cannot access subdirectory),
 2  if serious trouble (e.g., cannot access command-line argument).

Invalid/unknown command-line arguments count as 2.
---
 tests/ls.test   | 13 +++++++++++--
 toys/posix/ls.c |  8 +++++---
 2 files changed, 16 insertions(+), 5 deletions(-)
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