NXtomoScan: replace some deprecated code to tomoscan 'get_nexus_paths'

tomoscan/esrf/scan/nxtomoscan.py

@@ -1070,7 +1070,7 @@ class NXtomoScan(TomoScanBase):
             or self.nexus_path.nx_detector_paths.ESTIMATED_COR_FRM_MOTOR
         )
         if x_rot_path is not None:
-            nexus_paths = get_nexus_paths(self.nexus_version)
+            nexus_paths = _get_nexus_paths(self.nexus_version)
             x_rot_path = f"{nexus_paths.INSTRUMENT_PATH}/{self.nexus_path.nx_instrument_paths.DETECTOR_PATH}/{x_rot_path}"
 
             return self._get_generic_key(