fix: Clean up Log Directive hex output

[vezenovm]

Related issue(s)

Resolves #94

Summary of changes

We just now trim the zeroes for hex output.

Dependency additions / changes

(If applicable.)

Test additions / changes

I have seen the result of this output when testing the println PR on the Noir repo.

Checklist

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt with default settings.
• I have linked this PR to the issue(s) that it resolves.
• I have reviewed the changes on GitHub, line by line.
• I have ensured all changes are covered in the description.

Additional context

(If applicable.)