Tabs: simplify styled components code

[ciampo]

What?

Refactor the tablist styled component avoiding the render function (unnecessary)

Why?

Better and simpler code

Testing Instructions

Smoke test the component in Storybook, everything should look and work like on trunk

[github-actions]

Flaky tests detected in 526bec8.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/11386377379
📝 Reported issues:

• [Flaky Test] Entering zoomed out mode zooms the canvas #66051 in /test/e2e/specs/site-editor/zoom-out.spec.js

[github-actions]

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Co-authored-by: ciampo <mciampini@git.wordpress.org>
Co-authored-by: tyxla <tyxla@git.wordpress.org>

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[tyxla]

Makes sense, thanks 🚀