switch to function component with-react-intl example (#14217)
The example was using class-based component for custom _app, switched to functional component approach. **Sidenote:** The existing code didn't gave an error when navigated to a new page using the navbar ![Screenshot 2020-06-16 at 2 47 52 PM](https://user-images.githubusercontent.com/11258286/84760988-6cbebd80-afe6-11ea-9b7f-98aca7404895.png)
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