Update testing-custom-queries.md

[nicholas-keers]

The Java example code block was empty with the code displayed inline below it, I have removed whitespace to fix it as per the bottom image

Why:

Closes: #26277

What's being changed (if available, include any code snippets, screenshots, or gifs):

Changing this to put the Java code into the code-block correctly, will also fix other parts below it as the tags were spilling over.

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Source	Preview	Production	What Changed
code-security/codeql-cli/using-the-codeql-cli/testing-custom-queries.md	fpt ghec ghes@ 3.9 3.8 3.7	fpt ghec ghes@ 3.9 3.8 3.7

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ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

@nicholas-keers Thank you for opening a PR and linking it to your issue! ✨

Also, welcome to the community! I'll get this triaged for review! ⚡

In the meantime, if you'd like to find other ways to contribute, check out our help wanted section to find open issues you can work on. 👍

[subatoi]

@nicholas-keers Many thanks for spotting this. I changed the indentation such that the code box is part of numbered list, as intended, rather than rendered below it and independently of it. I've also noted where we need to change that in other places on this same page:

Many thanks for your interest in helping us to improve our docs! ✨

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Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡