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test: force C locale for printf in cellAreaM2 CLI test (#1176)

The testCliCellAreaM2 test pipes h3 output through 'xargs printf %.3f',
which formats the decimal separator per the system locale. On locales that
use ',' as the decimal separator the test produces 265092558,128 and fails,
even though h3 itself outputs the value correctly. Run printf under
LC_ALL=C so the separator is always '.'.

Fixes #1170

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