DAQ: Update dtz at the beginning of the measurement (before going to data collection)

daq/src/aaredaq/daq.py

@@ -243,6 +243,7 @@ class AareDAQ:
 
     def __raster(self, r: RasterGridRequest) -> CompletedRasterGrid:
         max_time = r.exp_time_s * r.n_y * r.n_x + 60
+        self.__cfg.dtz = r.dtz_mm
         self.__set_state(BeamlineStateEnum.DataCollection)
         self.__jfjoch.measure_raster(r, self.diffraction_geometry, self.sample)
         self.__devs.aerotech.move(r.omega_deg, wait=True, speed=360.0)
@@ -270,6 +271,7 @@ class AareDAQ:
             raise e
 
     def __rotation(self, request: RotationScanRequest):
+        self.__cfg.dtz = request.dtz_mm
         self.__set_state(BeamlineStateEnum.DataCollection)
 
         if request.start is not None: