Proto: Scoru: fix encoding when reading reveal_hash

Emma Turner requested to merge emturner@fix-reveal-hash into master


part of #4201 (closed)

Found during development of an e2e kernel tezt test, which uses the reveal hash mechanism. The incorrect decoding was causing the rollup node to ask for the preimage of the 'zero hash', which broke the tezt test.

Manually testing the MR

A tezt test MR testing the entire flow, including DAC, will be opened next week.


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Edited by Emma Turner

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