fix(v3-migration.page):APY type change buttons' background color cha…

[boombb12138]

General Changes

Related issue:
[https://github.com/aave/interface/issues/1897](url)

• Fixes the APY buttons' background color in both light mode and dark mode. These button are in the v3-migration.page

Developer Notes

Add any notes here that may be helpful for reviewers.

before this change the button background is :

result in the

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[foodaka]

thanks for the contribution @boombb12138

[boombb12138]

anyone can help review? Need one more review to perform merge~