Fix viewer issue where fps is not used correctly

[tylerlum]

The rendering is not working correctly for the hand_robot_viewer. Thus, following the position_retargeting example, the hand + robot example only shows the final state, not the movement of the objects + hands.

python visualize_hand_object.py --dexycb-dir=/juno/u/tylerlum/Downloads/dex_ycb_dataset/  --robots allegro shadow svh

This is because the wrong value is passed into the for loop, so I fixed it.

I also diffed hand_robot_view.py and hand_view.py, and then made 1 other change to make them more consistent

Current:

New (after fix)