nuPlan already standardizes dynamic quantities

[BorisIvanovic]

As can be seen in their schema, velocities and accelerations are already standardized for the ego-vehicle in nuPlan, meaning when trajdata tries to standardize things here, it yields incorrect velocities/accelerations.

This is unique to nuPlan as they handle the relativization of states for users (in contrast to other datasets). Will have to think about the best way to handle this prior to fixing it.