fix rendering for light mode on details table

[gingerwizard]

Summary

Fixes #2861

Before

After

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/en/integrations/index.mdx

[gjones]

This does fix the issue, so I guess we can merge. I'm unsure why the accordions are black in light mode anyway though. Ideally we'd just use Click UI accordions here. Maybe we can merge this and make a separate issue around transitioning the docs to using Click UI accordions.