Fix output path for the fabric provider
Fix output path for the fabric provider

Summary:
Changelog: [internal] Fixes the output path for the fabric provider.

The old path wouldn't work when the pod installation path is not the same as the app dir.

Reviewed By: cortinico

Differential Revision: D32911493

fbshipit-source-id: 74a8481a2e8397024645d7daff2897e4b0b5454e

javache/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,janicduplessis/react-native,facebook/react-native,janicduplessis/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,janicduplessis/react-native,javache/react-native,facebook/react-native,javache/react-native,javache/react-native,javache/react-native,facebook/react-native,facebook/react-native,facebook/react-native,facebook/react-native