Fix "Apply Orbit to Y"
Report by Philipp: Error in UndulatorOrbit steering when pressing "Apply Y": Traceback (most recent call last): File "UndulatorOrbit.py", line 262, in modify off[i]=np.array(self.Y_FB_REF[i]+weight*self.CapY[i]) AttributeError: 'UndulatorOrbit' object has no attribute 'CapY'