[NO-JIRA]fix BpkCheckboxV2 background color

[IrinaWei]

Remember to include the following changes:

• Ensure the PR title includes the name of the component you are changing so it's clear in the release notes for consumers of the changes in the version e.g [Clover-123][BpkButton] Updating the colour
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[Copilot]

Pull request overview

Removes a hard-coded background-color: tokens.$bpk-canvas-day from the BpkCheckboxV2 box element so the checkbox no longer forces a light-mode canvas background (which would render incorrectly in dark mode / on non-canvas surfaces).

Changes:

• Drop the background-color declaration from the .box style in BpkCheckboxV2.module.scss.

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[Richard-Shen (RichardSyq)]

lgtm