Update list-tables.css to contain common variables (lines 1 - 298) [https://core.trac.wordpress.org/ticket/62544]

[kj1999479]

Trac ticket:

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

Hi @kj1999479! 👋

Thank you for your contribution to WordPress! 💖

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[github-actions]

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Props kj1999.

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