fix: prevent __DEV__ is not defined on web

[ethanneff]

Description

Fixes (issue #)

error boundary ReferenceError: __DEV__ is not defined
    at FlashList.validateProps (FlashList.tsx:142:1)
    at new FlashList (FlashList.tsx:110:1)
    at constructClassInstance (react-dom.development.js:14323:1)
    at updateClassComponent (react-dom.development.js:19688:1)
    at beginWork (react-dom.development.js:21611:1)
    at beginWork$1 (react-dom.development.js:27426:1)
    at performUnitOfWork (react-dom.development.js:26557:1)
    at workLoopSync (react-dom.development.js:26466:1)
    at renderRootSync (react-dom.development.js:26434:1)
    at performSyncWorkOnRoot (react-dom.development.js:26085:1) 

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Screenshots or videos (if needed)

Checklist

• I have added a changelog entry following the Keep a Changelog guidelines.

[DawidWietrzych]

Any updates on this issue? I wanted to update FlashList from 1.4.0 to 1.6.4 and I have the same problem when using React Native for Web.