Remove override of createJSModules from OAuthManagerPackage.java

[ujeenator]

The current version of React Native 0.47 has removed the createJSModules method in ReactPackage. Therefore any overrides of this method will need to be removed from the library, or this will cause a compilation error.

facebook/react-native@ce6fb33

[freeworlder]

Yes, since RN 0.47 it's really necessary. I have to manually clean createJSModules every time.

[MBach]

Yes please! Make a new release without the override annotation.