Update test to import copy from main exports

Author: SukkaW

lib/copy/__tests__/copy-broken-symlink.test.js

@@ -5,7 +5,7 @@ const os = require('os')
 const fse = require('../..')
 const path = require('path')
 const assert = require('assert')
-const copy = require('../copy')
+const { copy } = require('../')
 
 /* global afterEach, beforeEach, describe, it */