Disabling translation and scaling now works.

These flags were ignored in the code. They have been inserted into the
event handling logic.

Change-Id: I31a03a8e4321a8a87cbf09503d731b2e5d335003
Merge topic '0014241-vtkSphereWidget2-ScalingEnabledOff' into master

399f778d Disabling translation and scaling now works.