onReturnToCameraScreen

Called when the user wants to add a picture of another page. Also called when the user hasdeleted every page and the document consisted of images taken with the Camera Screen orimported using the Camera Screen.

If you host the MultiPageReviewFragment in its own Activity, then you shouldsimply finish the Activity.

If you use one Activity to host all the Gini Capture fragments, then you should display the CameraFragmentCompat again.