GUI: Fix default parameters for DiffractionGeometry

gui/src/aaregui/main_window.py

@@ -54,7 +54,9 @@ class MainWindow(QMainWindow):
             dtz_mm=100,
             detector_size_pxl=(1553,1630),
             pixel_size_mm=0.150, #PILATUS 4
-            beam_center_pxl=(750, 750)
+            beam_center_pxl=(750, 750),
+            detector_description="PILATUS 4",
+            detector_serial_number="1"
         )
 
         geom = SampleGeometryModel(beam_location_pxl=Coordinate(x=1000,y=1000),