Update overage opt-in card to match other cards

What does this MR do and why?

Updates overage opt-in card to match other cards design.

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

• yarn storybook:start
• Open http://localhost:6006/?path=/story/ee-usage-quotas-usage-billing-app--no-commitment-no-monthly-waiver-no-overage

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.