fix: fix da verifier row root node creation (#197)

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## Overview

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closes #193

The test that fails if this fix is absent is in here:
#160

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src/lib/verifier/DAVerifier.sol

@@ -107,11 +107,9 @@ library DAVerifier {
         uint256 cursor = 0;
         for (uint256 i = 0; i < _sharesProof.shareProofs.length; i++) {
             uint256 sharesUsed = _sharesProof.shareProofs[i].endKey - _sharesProof.shareProofs[i].beginKey;
-            NamespaceNode memory rowRoot =
-                NamespaceNode(_sharesProof.namespace, _sharesProof.namespace, _sharesProof.rowRoots[i].digest);
             if (
                 !NamespaceMerkleTree.verifyMulti(
-                    rowRoot,
+                    _sharesProof.rowRoots[i],
                     _sharesProof.shareProofs[i],
                     _sharesProof.namespace,
                     slice(_sharesProof.data, cursor, cursor + sharesUsed)