Changed API of beam element transformations active

Author: szymonlopaciuk

xcoll/line_tools.py

@@ -338,7 +338,7 @@ def get_aperture(self, name, *, s_start, s_end, aperture=None, table=None, s_tol
                 if aper_mid is None:
                     raise ValueError(f"No aperture found for {name}! Please provide one.")
                 if self.line[aper_mid].allow_rot_and_shift \
-                and xt.base_element._tranformations_active(self.line[aper_mid]):
+                and self.line[aper_mid].transformations_active:
                     print(f"Warning: Using the centre aperture for {name}, but "
                         + f"transformations are present. Proceed with caution.")
                 aper1 = aper_mid