Add missing update calls in OrbitControls

Calls to scope.update() was missing in the mousewheel and touchmove event handlers

commit 352ed93babafa63355232c9213d7c9c63fe55da0 added calls to scope.update() from
https://github.com/greggman/three.js/commit/fde9f9917d6d8381f06bf22cdff766029d1761be