Fixed generation of plugin entry point after compilation
Fixed generation of plugin entry point after compilation

Summary: This diff fixes an issue, that due to recent changes `defaultPlugins/index.tsx` wouldn't compile without being regenerated. This caused issue for people after updating and running `yarn install`. This diff fixes the build order to first generate the file, then compile

Reviewed By: nikoant

Differential Revision: D33276108

fbshipit-source-id: 318a9c8434ecf3cae3b15474fa045e93ad5ffc42

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper