fix: Remove unused captures in example code

[mikomikotaishi]

This PR removes unused captures from lambdas, which should resolve some previous warnings during example builds.

Additionally, I have changed the alignments of the ampersand to be on the left, to be consistent with most examples (which do this already; the code examples would sometimes use three different alignments in the same file).

This continues to decrease the surface area of #1530.

Code change checklist

• I have ensured that all methods and functions are fully documented using doxygen style comments.
• My code follows the coding style guide.
• I tested that my change works before raising the PR.
• I have ensured that I did not break any existing API calls.
• I have not built my pull request using AI, a static analysis tool or similar without any human oversight.

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