TMSS-344: Add refresh from db to rule out non-permanent change of pinning

SAS/TMSS/test/t_tmssapp_specification_django_API.py

@@ -495,6 +495,9 @@ class TaskDraftTest(unittest.TestCase):
         scheduling_unit_2 = models.SchedulingUnitDraft.objects.create(**SchedulingUnitDraft_test_data(scheduling_set=scheduling_set_2))
         task_draft_2 = models.TaskDraft.objects.create(**TaskDraft_test_data(scheduling_unit_draft=scheduling_unit_2))
 
+        task_draft_1.refresh_from_db()
+        task_draft_2.refresh_from_db()
+
         # assert
         self.assertFalse(task_draft_1.output_pinned)
         self.assertTrue(task_draft_2.output_pinned)