Summary:
Macro `ENABLE_PACKAGER_CONNECTION` invalid because of `__has_include` can't find the header now. Leads to packager connection not work anymore.
## Changelog
[iOS] [Fixed] - Fixes iOS packager connection not work
Pull Request resolved: https://github.com/facebook/react-native/pull/25803
Test Plan:
1. Init a new project.
2. Run and input `curl http://localhost:8081/reload` in terminal. Reload operation can execute.
Differential Revision: D16458384
Pulled By: TheSavior
fbshipit-source-id: 27e7e02b5666a2131e995accd34e4da7bad42335
zhongwuzwandFacebook Github Bot
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