test: fix required common import order in snapshot transform test

Author: cwkang

test/parallel/test-assert-snapshot-transform-project-root.js

@@ -1,5 +1,6 @@
 'use strict';
 
+const common = require('../common');
 const assert = require('node:assert/strict');
 const path = require('node:path');
 const { pathToFileURL } = require('node:url');