Fix error on reload site click

[bgrgicak]

What is this PR doing?

This PR fixes an error when the Delete stored data and start fresh button is clicked.

What problem is it solving?

It allows users to use the Delete stored data and start fresh checkbox.

How is the problem addressed?

This PR adds a default value false to prevent form errors when the default value is undefined.
It also adds a try/catch around resetVirtualOpfs to ensure Playground doesn't break if resetVirtualOpfs isn't available.

Testing Instructions

• Checkout this branch
• Run npm run dev
• Open Playground
• In the header select Browser storage and Delete stored data and start fresh
• Click apply changes
• Confirm that there were no errors and your site reloaded with the storage=browser query string

[adamziel]

Looks great, thank you!