change the coordinate parameter back to Z in the ExtractLevelFunction…

….edit_request call to tv.remove_scalar

so that the method properly repopulates the Vertical Level coordinate for the 4-D alternate variable

src/preprocessor.py

@@ -562,9 +562,8 @@ def edit_request(self, v: varlist_util.VarlistEntry, **kwargs):
             for var_dict in new_tv_dict.values():
                 if var_dict['ndim'] == 4:
                     new_tv_name = var_dict['name']
-        time_coord = [c for c in tv.scalar_coords if c.axis == 'T'][0]
         new_tv = tv.remove_scalar(
-            time_coord.axis,
+            'Z',
             name=new_tv_name
         )