Badge: Fix up extra newline in readme

[mirka]

Follow-up to #68317

What?

Removes an extra newline in the Badge component readme that is currently causing a CI check to fail on trunk.

[github-actions]

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Co-authored-by: mirka <[email protected]>

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[github-actions]

Flaky tests detected in 6bf6522.
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/12518966235
📝 Reported issues:

• [Flaky Test] Navigates the items list via UP/DOWN arrow keys #64334 in /test/e2e/specs/site-editor/dataviews-list-layout-keyboard.spec.js