[Toybox] bc comparison bug fix

[Gavin Howard]

Hello,

Attached is a patch to fix a comparison bug in bc. See
https://github.com/gavinhoward/bc/pull/25 and
https://github.com/gavinhoward/bc/pull/25/commits/ddbecaa0601375b86dffb525973148cdd0dda8f7

Gavin Howard
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