rn-debugger is broken with react-native ^0.59

With the extraction of the cli to [@react-native-community/cli](https://github.com/react-native-community/react-native-cli), the debugger is not starting anymore, failing with `FAIL Inject RemoteDev server into React Native local server, the file not found.`

It seems to be looking for the server.js file in the wrong place.

I'm using version `0.8.4` with react-native `0.59.10`.

Start by tracing how the debugger locates and injects into React Native's local server, focusing on the expected server.js path after the CLI moved to @react-native-community/cli. Reproduce the failure with remotedev-rn-debugger 0.8.4 and React Native 0.59.10, then verify that the debugger starts without the file-not-found error.

Written by the indexing model from the issue text.