fix(stats): fetch check_flags as that is needed

It is used while constructing the object to store
old_component_settings.

Fixes WEBLATE-28VW

weblate/utils/stats.py

@@ -1237,7 +1237,7 @@ def get_update_objects(self):
             yield from self._object.project.stats.get_update_objects()
 
     def get_child_objects(self):
-        return self._object.component_set.only("id", "category")
+        return self._object.component_set.only("id", "category", "check_flags")
 
     def get_category_objects(self):
         return self._object.category_set.only("id", "category")
@@ -1258,7 +1258,7 @@ def has_review(self):
         return self._object.enable_review
 
     def get_child_objects(self):
-        return self._object.component_set.only("id", "project")
+        return self._object.component_set.only("id", "project", "check_flags")
 
     def get_single_language_stats(self, language):
         return ProjectLanguageStats(ProjectLanguage(self._object, language))