fix: integer autocompletes no longer cause crash

[Jaskowicz1]

This PR fixes #962, checking if a value from an autocomplete is actually what we expect it to be, rather than unsafely assuming. This caused a crash because discord sends "" upon on_autocomplete (no data), however, because the type is int, it can't convert to int so it throws instead. This no longer happens and we now just don't bother with the set if the type doesn't match.

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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