Summary: This pull request removes the hard-coded version of the `metro-react-native-babel-preset` as defined in the `init` command. That way, the version always matches React Native version specified in its `package.json`, making it match Metro version.
Differential Revision: D9759540
Pulled By: hramos
fbshipit-source-id: 90835442e2db1900851cbfb8c3c625229184d851