Readonly checkbox and radio shouldn't have a background

[origami-z]

Package name(s)

Core (@salt-ds/core)

Package version(s)

No response

Description

Not on spec, readonly checkbox & checkbox ~~shouldn't have a background~~ should reference a new readonly token.

https://www.figma.com/file/hWEpxUvJlNV6xy9pVDgxGT/Checkbox?type=design&node-id=1%3A52295&mode=design&t=wQRY8yS8Uu8y02FE-1

Steps to reproduce

No response

Expected behavior

No response

Operating system

• [ ] macOS
• [ ] Windows
• [ ] Linux
• [ ] iOS
• [ ] Android

Browser

• [ ] Chrome
• [ ] Safari
• [ ] Firefox
• [ ] Edge

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