update precomp_quantum to work with new ifo_power function

gwinc/ifo/noises.py

@@ -148,8 +148,7 @@ def precomp_suspension(f, ifo):
 def precomp_quantum(f, ifo):
     pc = Struct()
     mirror_mass = mirror_struct(ifo, 'ETM').MirrorMass
-    pbs, parm, _, _, _ = ifo_power(ifo)
-    power = Struct(parm=parm, pbs=pbs)
+    power = ifo_power(ifo)
     noise_dict = noise.quantum.shotrad(f, ifo, mirror_mass, power)
     pc.ASvac = noise_dict['ASvac']
     pc.SEC = noise_dict['SEC']