Fix: setting app-element in react-modal Modal component

[s4nju]

Description

Added app-element to the react-modal, earlier it was giving warning, which is now fixed in this PR.

Notion Test Page ID

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
react-notion-x	✅ Ready (Inspect)	Visit Preview	Jun 4, 2023 0:01am
react-notion-x-minimal-demo	✅ Ready (Inspect)	Visit Preview	Jun 4, 2023 0:01am

[transitive-bullshit]

Thanks! 🙏