Casl/Vue + Storybook unable to access $can global

**Describe the bug**
Property "$can" was accessed during render but is not defined on instance.

**To Reproduce**
In a storybook preview.ts I used

```ts
setup((app) => {
...
  app.use(abilitiesPlugin, ability, {
    useGlobalProperties: true
  })
...
})
```

**Expected behavior**
global registration of casl/vue should work in storybook 

