fix(data): set correct nullifier hash parameter

Former-commit-id: d36a79e

Author: cedoor

packages/data/src/ethers.ts

@@ -275,7 +275,7 @@ export default class SemaphoreEthers {
             signal: event.signal.toString(),
             merkleTreeRoot: event.merkleTreeRoot.toString(),
             externalNullifier: event.externalNullifier.toString(),
-            nullifierHash: event.externalNullifier.toString()
+            nullifierHash: event.nullifierHash.toString()
         }))
     }
 }