Update covalent-m3.json

[owilliams320]

Description

removing the % sign in the tokens naming.

What's included?

• removing mention of % in light/dark tokens

Test Steps

• [ ] npx build tokens
• [ ] then view the output in build/libs/tokens

General Tests for Every PR

• [ ] npm run start still works.
• [ ] npm run lint passes.
• [ ] npm run stylelint passes.
• [ ] npm test passes and code coverage is not lower.
• [ ] npm run build still works.

[owilliams320]

:tada: This PR is included in version 8.20.0 :tada:

The release is available on:

• v8.20.0
• GitHub release

Your semantic-release bot :package::rocket: