After load Maya scene, restore the value during compute
After load Maya scene, restore the value during compute

When createAsset() is called during file load, parameter values aren't
loaded yet. So we can't restore the parameter values here.

sideeffects/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya,pokyfudywise/HoudiniEngineForMaya,sideeffects/HoudiniEngineForMaya,pokyfudywise/HoudiniEngineForMaya,pokyfudywise/HoudiniEngineForMaya