Hotfix: Fix clone issue with vue.extend components

[blake-newman]

• Moving the previous extend fix logic out to mount and shallow
  hooks fixes cloning of component

issue

import { mount } from 'vue-test-utils'
import ContainerTest from 'container/Test.vue'

const options = {
  mocks: { $route: 'test' }
}

const wrapper = mount(ContainerTest, options)
console.log(wrapper.vm.$route) // test

const wrapper2 = mount(ContainerTest)
console.log(wrapper2.vm.$route) // test

Fix

import { mount } from 'vue-test-utils'
import ContainerTest from 'container/Test.vue'

const options = {
  mocks: { $route: 'test' }
}

const wrapper = mount(ContainerTest, options)
console.log(wrapper.vm.$route) // test

const wrapper2 = mount(ContainerTest)
console.log(wrapper2.vm.$route) // undefined