Merge pull request #347 from donandren/fixlayoutscaleios

touch events  ios no scale

src/iOS/Perspex.iOS/PerspexView.cs

@@ -186,14 +186,11 @@ namespace Perspex.iOS
                         RawMouseEventType.Move, location, InputModifiers.LeftMouseButton));
                 else
                 {
-                    double x = location.X - _touchLastPoint.X;
+                    //magic number based on test - correction of 0.02 is working perfect
-                    double y = location.Y - _touchLastPoint.Y;
                     double correction = 0.02;
-                    var scale = PerspexLocator.Current.GetService<IPlatformSettings>().RenderScalingFactor;
-                    scale = 1;
 
                     Input?.Invoke(new RawMouseWheelEventArgs(PerspexAppDelegate.MouseDevice, (uint)touch.Timestamp,
-                        _inputRoot, location, new Vector(x * correction / scale, y * correction / scale), InputModifiers.LeftMouseButton));
+                        _inputRoot, location, (location - _touchLastPoint)* correction, InputModifiers.LeftMouseButton));
                 }
                 _touchLastPoint = location;
             }