Fix number of GPU units in RunningFrameInfo

[splhack]

Fix a bug introduced in #924

• rqnetwork.py numGpus is always 0 😞
• It can just use runFrame.num_gpus.
  • Because this code block is working correctly

    OpenCue/rqd/rqd/rqcore.py

    Lines 865 to 868 in c22fe12

    	if runFrame.num_gpus:
    	reserveGpus = self.machine.reserveGpus(runFrame.num_gpus)
    	if reserveGpus:
    	runFrame.attributes['GPU_LIST'] = reserveGpus

[bcipriano]

LGTM, also makes it consistent with num_cores which is nice 👍