Use graphene List instead of FilterOderList for non-django types

aleksis/apps/alsijil/schema/__init__.py

@@ -41,7 +41,7 @@ class Query(graphene.ObjectType):
     groups_by_person = FilterOrderList(GroupType, person=graphene.ID())
     courses_of_person = FilterOrderList(CourseType, person=graphene.ID())
 
-    lessons_for_persons = FilterOrderList(
+    lessons_for_persons = graphene.List(
         LessonsForPersonType,
         persons=graphene.List(graphene.ID, required=True),
         start=graphene.Date(required=True),