test: fix bad reference to vtu package

Author: dobromir-hristov

Diff for: test/specs/wrapper.spec.js

@@ -1,5 +1,5 @@
 import { describeWithShallowAndMount } from '~resources/utils'
-import { enableAutoDestroy, resetAutoDestroyState } from '~vue/test-utils'
+import { enableAutoDestroy, resetAutoDestroyState } from '@vue/test-utils'
 
 describeWithShallowAndMount('Wrapper', mountingMethod => {
   ;['vnode', 'element', 'vm', 'options'].forEach(property => {