Update React-RCTAppDelegate.podspec syntax error for USE_HERMES=1

[rocketraman]

Summary:

The USE_HERMES flag is set not escaped correctly by React-RCTAppDelegate.podspec, and it does not apply.

The flag needs to be defined as USE_HERMES\=1, but is currently set as USE_HERMES.

Hopefully this will fix #38193.

See #38193 (comment).

Changelog:

Pick one each for the category and type tags:

[IOS] [FIXED] - Fix imports from RCTAppSetupUtils when Hermes is active

Test Plan:

I made the change in my local project and it fixed issues I was having with building my React Native project. See #38193 (comment).

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[realsoelynn]

@rocketraman Also please sign the CLA before we can proceed further.

[rocketraman]

@rocketraman Also please sign the CLA before we can proceed further.

This is done.

[facebook-github-bot]

@realsoelynn has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@realsoelynn merged this pull request in 143437a.

[react-native-bot]

This pull request was successfully merged by @rocketraman in 143437a

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