Revert to using image prop and use @2x @3x images

mobile/src/ARViewer/ARViewer.js

@@ -69,6 +69,7 @@ class WorkItemSceneAR extends React.Component {
             <Viro3DObject
               position={[0, 0, 0]}
               source={shapes["hardhat"].shape}
+              resources={shapes["hardhat"].materials}
               type="OBJ"
             />
             <ViroSurface