Hide backdrop-filter outline on dock

[davej]

If the dock has a window underneath then you can see the outline of the rectangular blur filter

You can fix this with a border-radius of 20px.

[vercel]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployment, click below or on the icon next to each commit.

🔍 Inspect: https://vercel.com/puruvj/macos-web/7pmLpNffumN66MMCqTFhiVFbMMpj
✅ Preview: https://macos-web-git-fork-davej-patch-1-puruvj.vercel.app

[PuruVJ]

Thanks!!!