chore: remove extra println in noir protoco circuit (#3219)

Smol PR to remove the extra println

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
the PR is ready to merge.
- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [ ] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [ ] Every change is related to the PR description.
- [ ] I have
[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
this pull request to relevant issues (if any exist).

yarn-project/noir-protocol-circuits/src/crates/rollup-lib/src/merkle_tree.nr

@@ -13,7 +13,6 @@ impl<N> MerkleTree<N> {
 
         // hash base layer
         for i in 0..half_size {
-            dep::std::println(i);
             nodes[i] = dep::std::hash::pedersen_hash([leaves[2*i], leaves[2*i+1]]);
         }