Bug: Omnipanda spawned with some initial velocity

[cpezzato]

When running omnipanda_isaacgym_server and client, the robot is spawned with some initial velocity. Reproduce the bug in branch ft-add-pushing by running the omnipanda examples.

This happened after merging the last changes from main. It can be seen also by setting the actions sent to 0 and starting the example.

[c-salmi]

This is likely because you're setting the initial dof_state of the prismatic joints to [-1, -1] here But the actor is already loaded at initial location [-1, -1] so the whole reference frame for the joints has shifted there. So you should pass [0.0, 0.0] to the initial dof_state instead.