Removed unneeded calculations in InputVtcExample
Removed unneeded calculations in InputVtcExample

Removed unneed calculations to calculate the mass of the box object in
InputVtcExample. The RigidRepresentationParameters is able to calculate
the mass, so we use that here instead.

simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim,simquest/opensurgsim