make tests require the symlinked realm module

tests/js/worker-tests-script.js

@@ -21,7 +21,7 @@
 
 'use strict';
 
-const Realm = require('../..');
+const Realm = require('realm');
 
 process.on('message', (message) => {
     process.send(handleMessage(message));

tests/spec/unit_tests.js

@@ -24,7 +24,7 @@
 const fs = require('fs');
 const path = require('path');
 
-const Realm = require('../..');
+const Realm = require('realm');
 const RealmTests = require('../js');
 
 // Create this method with appropriate implementation for Node testing.