fix: pad entry string in l1 to l2 tests

[Maddiaa0]

Description

fixes #795

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Checklist:

• I have reviewed my diff in github, line by line.
• Every change is related to the PR description.
• I have linked this pull request to the issue(s) that it resolves.
• There are no unexpected formatting changes, superfluous debug logs, or commented-out code.
• The branch has been merged or rebased against the head of its merge target.
• I'm happy for the PR to be merged at the reviewer's next convenience.

[ludamad]

LGTM, technically hard to tell if fixed but we can be optimistic on this one

[Maddiaa0]

yeah agree its hard to tell, however fr.toString() does go to the smallest size, i think it was just a hash getting lucky and ending up being under 32 bytes. But yet again its all speculation