Issue #293 fix column excluded column in subject list

The column excluded wasn't working properly.

smash/web/api_views/subject.py

@@ -245,6 +245,8 @@ def get_subjects_filtered(subjects_to_be_filtered, filters):
             result = result.filter(resigned=(value == "true"))
         elif column == "postponed":
             result = result.filter(postponed=(value == "true"))
+        elif column == "excluded":
+            result = result.filter(excluded=(value == "true"))
         elif column == "information_sent":
             result = result.filter(information_sent=(value == "true"))
         elif column == "health_partner_first_name":