GUI: Fix menu not loading in beam location mode

gui/src/aaregui/widgets/camera_image.py

@@ -118,6 +118,8 @@ class SampleCameraImageLabel(QGraphicsView):
         self.start_point = self.mapToScene(event.pos())
 
         match self.__state:
+            case SampleCameraImageState.BEAM_MARKING:
+                self.click_timer.start(self.right_click_hold_threshold)
             case SampleCameraImageState.IDLE:
                 self.click_timer.start(self.right_click_hold_threshold)
                 if event.button() == Qt.MouseButton.RightButton: