VIRO-2190 Make Back Button work on Release Test
VIRO-2190 Make Back Button work on Release Test

We just remove the ViroSceneNavigator from React Native... that
did cause a crash (VIRO-2225), but this code works.


Former-commit-id: bd8a3f18b671d0b6851ace5b3480ab01fe1092c8
viromedia/viro,viromedia/viro,viromedia/viro,viromedia/viro