[Toybox] [PATCH] Use $(( rather than $[ for arithmetic in expand.test.

[enh]

I can't find any reference to $[ for arithmetic on the bash man page, but it
seems to be a synonym for $((. mksh doesn't support this, so the expand
tests
that use it fail on Android. No other toybox tests are using $[.
---
 tests/expand.test | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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