CheckboxButton no longer leaks HoistInputProps into underlying HTML <button>

[cnrudd]

I came across this issue when testing an email scheduler whose form has
fieldDefaults: {commitOnChange: true,... and a checkboxButton formField.

Hoist P/R Checklist

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• Caught up with develop branch as of last change.
• Added CHANGELOG entry, or determined not required.
• Reviewed for breaking changes: not a breaking change
• Updated doc comments / prop-types, or determined not required.
• Reviewed and tested on Mobile: changed on mobile as well.
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[amcclain]

Thanks much for fixing.