ci/codeql: In-line the paths-ignore config

[issyl0]

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• https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/customizing-your-advanced-setup-for-code-scanning#specifying-configuration-details-using-the-config-input
• And I noticed the indentation of the workflow YAML was weird. (Probably worth a ?w=1 on this review to ignore whitespace.)