codeql: Remove unneeded advanced config file

[anomiex]

Proposed changes:

GitHub has a "default" config and an "advanced" config. It turns out the "advanced" config we have here doesn't do anything very advanced, we can switch to the default config.

See https://github.com/Automattic/jetpack/security/code-scanning/438

When I did that, it disabled the workflow but didn't create a PR to delete this file for us. Guess we have to do that manually.

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Jetpack product discussion

None

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• 🤷

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[tbradsha]

I first typed 🦐 but meant 🤷. 🪓!