Fix T81488: Deleting an Object Constraint crashes Blender

The edit_constraint_property_get function was using bone constraints
in pose mode even for object constraints. This change mirrors the code
in `uiTemplateConstraints` as well.

Differential Revision: https://developer.blender.org/D9128

source/blender/editors/object/object_constraint.c

@@ -818,7 +818,7 @@ static bConstraint *edit_constraint_property_get(bContext *C, wmOperator *op, Ob
     list = ED_object_pose_constraint_list(C);
   }
   else {
-    list = ED_object_constraint_active_list(ob);
+    list = &ob->constraints;
   }
 
   con = BKE_constraints_find_name(list, constraint_name);