vtkVelodynePacketInterpreter: default IntraFiring to true
vtkVelodynePacketInterpreter: default IntraFiring to true

Previously that was defaulted to true only in C++, but to false in
LidarView/Python due to error in xml.

Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView,Kitware/VeloView