bug: correct merkle test vector paths in replica tests

solidity/lib/ProcessingReplica.abi.json

@@ -335,7 +335,7 @@
       },
       {
         "internalType": "bytes",
-        "name": "_ret",
+        "name": "_result",
         "type": "bytes"
       }
     ],

solidity/test/Replica.test.js

@@ -1,10 +1,10 @@
 const { waffle, ethers } = require('hardhat');
 const { provider, deployMockContract } = waffle;
 const { expect } = require('chai');
-const MockRecipient = require('../artifacts/contracts/test/MockRecipient.sol/MockRecipient.json');
 
 const testUtils = require('./utils');
-const { testCases } = require('./Merkle/merkleTestCases.json');
+const { testCases } = require('../../vectors/merkleTestCases.json');
+const MockRecipient = require('../artifacts/contracts/test/MockRecipient.sol/MockRecipient.json');
 
 const originSLIP44 = 1000;
 const ownSLIP44 = 2000;