Remove redundant ivar to fix cppcheck warnings
Remove redundant ivar to fix cppcheck warnings

cppcheck warned:

vtkUncertaintyTubeFilter.cxx:83,warning,Member variable 'vtkTubePoint::V0' is not assigned a value in 'vtkTubePoint::operator='.
vtkUncertaintyTubeFilter.cxx:83,warning,Member variable 'vtkTubePoint::V1' is not assigned a value in 'vtkTubePoint::operator='.
vtkUncertaintyTubeFilter.cxx:83,warning,Member variable 'vtkTubePoint::V2' is not assigned a value in 'vtkTubePoint::operator='.
vtkUncertaintyTubeFilter.cxx:83,warning,Member variable 'vtkTubePoint::Vector' is not assigned a value in 'vtkTubePoint::operator='.

I did 2 fixes:
- actually copy 'Vector' is the copy ctor
- remove the 'V' ivar because it was merely an alias to 3 other ivars

keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,SimVascular/VTK,SimVascular/VTK,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,SimVascular/VTK,keithroe/vtkoptix,keithroe/vtkoptix,keithroe/vtkoptix,SimVascular/VTK