Fix missing returns and assignments in relation to supervision querysets

aleksis/apps/chronos/managers.py

@@ -522,7 +522,7 @@ class SupervisionQuerySet(ValidityRangeRelatedQuerySet, WeekQuerySetMixin):
 
     def filter_by_weekday(self, weekday: int):
         """Filter supervisions by weekday."""
-        self.filter(
+        return self.filter(
             Q(break_item__before_period__weekday=weekday)
             | Q(break_item__after_period__weekday=weekday)
         )

aleksis/apps/chronos/util/build.py

@@ -129,7 +129,7 @@ def build_timetable(
         )
 
         if is_person:
-            supervisions.filter_by_weekday(date_ref.weekday())
+            supervisions = supervisions.filter_by_weekday(date_ref.weekday())
 
         supervisions_per_period_after = {}
         for supervision in supervisions: