fix: verify proof bug

[tplooker]

Description

Found due to this upstream bug report, the logic around determining which messages were revealed from the proof based on the proof value was resulting in an index out of bounds issue in certain circumstances.

• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] The commit message(s) follow conventional commits
• [ ] Documentation has been added / updated (for bug fixes / features)
• [ ] Changes follow the contributing document.

Motivation and Context

See above

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Which merge strategy will you use?

• [x] Squash
• [ ] Rebase (REVIEW COMMITS)