message: always use persisted pipette volume
diff: @@ -158,10 +158,6 @@ class Pipette(Instrument):
  self.calibrator = Calibrator(self.robot._deck, self.calibration_data)
  - if helpers.is_number(max_volume) and max_volume > 0:
  - self.max_volume = max_volume
  - self.update_calibrations()
  -
  def update_calibrator(self):
  self.calibrator = Calibrator(self.robot._deck, self.calibration_data)
  