Update vtkBoneWidget only when necessary
Update vtkBoneWidget only when necessary

Previously, there was still some set...() methods that did not check
 (or improperly) if the new values changed, causing unecessary
computations and ModifiedEvent() to be fired.

Issue #13656

vovythevov/Bender,vovythevov/Bender,finetjul/bender,finetjul/bender,ricortiz/BenderCraniosynostosis,ricortiz/Bender,ricortiz/Bender,ricortiz/BenderCraniosynostosis,ricortiz/BenderCraniosynostosis,finetjul/bender,kitleo/bender,ricortiz/Bender,kitleo/bender,vovythevov/Bender,finetjul/bender,ricortiz/BenderCraniosynostosis,vovythevov/Bender,ricortiz/Bender,kitleo/bender