fix: fix ada holder voting power calculation

[MSzalowski]

List of changes

• fix ada holder voting power calculation

Checklist

• [x] My changes generate no new warnings
• [x] My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the changelog
• [ ] I have added tests that prove my fix is effective or that my feature works

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:white_check_mark: All checks succeeded