[Toybox] [PATCH] chmod: fix +X.

[enh]

I broke this when I added the masking out of the S_IFMT bits for macOS,
because string_to_mode needs the full mode with those extra bits,
specifically so that it can recognize directories for +X to work.

I've duplicated chtest rather than change chtest to explicitly set the
modes to 000 before running the given chmod command because I didn't
want to touch *all* the tests and obscure the addition of just one.
---
 tests/chmod.test   | 5 +++++
 toys/posix/chmod.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)
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