Tracking is not working on iOS

Hey,
By setting `enableTouchTracking` to true, dragging is not working on iOS.
Changing
```
if(controlMethod == .both){
``` 
to
```
if(controlMethod == .motion){
```
will make it work.
https://github.com/lightbasenl/react-native-panorama-view/blob/master/ios/CTPanoramaView.swift#L384