Remove check for even code version when deciding on rescind payload structure
Summary: Comprehensive explantion on why this change was necessary can be found in this comment: https://linear.app/comm/issue/ENG-4453#comment-a68b5cf6.
Test Plan:
- Change NEXT_CODE_VERSION to zero in version-utils.js.
- Build iOS app with odd code version.
- Ensure encrypoted rescidns work
Reviewers: tomek, ashoat
Reviewed By: ashoat
Differential Revision: https://phab.comm.dev/D8671