examples.tutorial_storage: fix assertion

Previously this simply duplicated the previous assertion used
to check the result of `obj_store.get_identifiable()`.

basyx/aas/examples/tutorial_storage.py

@@ -97,7 +97,7 @@
              for reference in aas.submodel]
 
 # The first (and only) element of this list should be our example submodel:
-assert submodel is tmp_submodel
+assert submodel is submodels[0]
 
 # Now, let's manually create a reference to the Property within the submodel. The reference uses two keys, the first one
 # identifying the submodel by its id, the second one resolving to the Property within the submodel by its