Fixing lint issue

Author: rossops

dojo/utils.py

@@ -29,7 +29,7 @@
 from django.contrib.auth.signals import user_logged_in, user_logged_out, user_login_failed
 from django.contrib.contenttypes.models import ContentType
 from django.core.paginator import Paginator
-from django.db.models import Case, Count, F, IntegerField, Q, Subquery, Sum, Value, When
+from django.db.models import Case, Count, F, IntegerField, Q, Sum, Value, When
 from django.db.models.query import QuerySet
 from django.db.models.signals import post_save
 from django.dispatch import receiver