Fix HERMES_ENABLED check in scripts/react-native-xcode.sh

[nvojnovic]

Summary

Checking if Hermes is enabled is failing because there is no podfile.lock file in the directory where this script is executed and USE_HERMES will be set to false which will prevent building Hermes binary jsbundle.

Changelog

[iOS] [Fixed] - HERMES_ENABLED check fixed in react-native-xcode.sh

Test Plan

1. Enable Hermes
2. Make a release build
3. Verify the main.jsbundle file is Hermes binary bundle

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[react-native-bot]

This pull request was successfully merged by @nvojnovic in 8745a14.

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