[Toybox] [PATCH] chmod.test: fix the tests to work on mksh as well as bash.

[enh]

mksh doesn't support the {a..b} bashism or the ${!name} bashism, causing
the tests to fail on Android.

This works for me on both mksh and bash (both tested on Debian).
---
 tests/chmod.test | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)
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