Built in react-devtools does not connect to real device

React Native Debugger app version: 0.8.1
React Native version: 0.55.4
Platform: iOS
Is real device of platform: Yes
Operating System: macOS

I have used [a snippet](https://github.com/expo/expo/issues/849#issuecomment-357455841) to set up `react-devtools` on a real device, and it works fine with a standalone version of `react-devtools`. At some point it also worked with the one built into inspector, but after some point it stopped connecting, and nothing really helps (I also tried to uninstall it using brew).

Can this be related to some cache files which are not touched by brew installation? If I can help somehow to debug this please, let me know.

Das Issue nennt keine Dateien, Tests oder Einstiegspunkte. Beginne damit, den Fehler mit react-native-debugger 0.8.1, React Native 0.55.4, iOS und einem echten Gerät unter Verwendung des verlinkten react-devtools-Setups zu reproduzieren; fertig ist es, wenn die integrierten React DevTools erfolgreich eine Verbindung herstellen.

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