captcha: fix non-mutating compare

[nicholascalvert85]

avoid mutating stored captcha during validation by comparing normalized strings.

[coderabbitai]

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[vponkratina]

The PR resolves a critical bug by ensuring that the stored captcha value isn't mutated during validation, following a more functional approach by creating normalized copies for comparison. However, I couldn't review this PR in more detail because I couldn't retrieve specific coding conventions for this programming language. If you'd like me to proceed otherwise or check for something specific, let me know!