docs: code tabs in webkit

[bennypowers]

Closes #1993

What I did

1. remove superfluous overflow property from code tabs pattern, which somehow fixes this problem 🤷

Testing Instructions

1. https://deploy-preview-2159--red-hat-design-system.netlify.app/elements/code-block/code/
2. https://deploy-preview-2159--red-hat-design-system.netlify.app/theming/customizing/
3. https://deploy-preview-2159--red-hat-design-system.netlify.app/theming/color-palettes/

Notes to Reviewers

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Latest commit: 4b0e9a3

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[github-actions]

Size Change: -2 B (0%)

Total Size: 207 kB

Filename	Size	Change
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_{compressed-size-action}

[bennypowers]

There's a follow-on issue here with the active tab not showing the red stripe (see commit and revert). This should be handled in a separate PR

[adamjohnson]

Lingering Ghosts, Tabs Mended.

Great work Benny!