fix: remove old vega css for forcing full width

[mscolnick]

Fixes #4746

This was some old css before we added display: contents to marimo-ui-element, so we don't need this anymore. This then would effect mo.hstack

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Name	Status	Preview	Comments	Updated (UTC)
marimo-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 30, 2025 6:00pm

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🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.13.4-dev5