Current Attitude Dynamics Model Doesn't Support Halting Wheel Speeds

[kylekrol]

@knk38 discovered in full mission HOOTL/HITL testing that attitude dynamics aren't properly modeled during a reaction wheel fault. The wheel speed going to zero aren't properly modeled as no momentum is dumped back into the spacecraft.

The fix here would most likely be pretty complicated because the wheel speed is being modeled and read from hardware in the HITL case.