Set updated date on list when item is added

bookwyrm/views/list.py

@@ -32,7 +32,7 @@ class Lists(View):
             item_count=Count("listitem", filter=Q(listitem__approved=True))
         ).filter(
             item_count__gt=0
-        ).distinct().all()
+        ).order_by("-updated_date").distinct().all()
 
         lists = privacy_filter(
             request.user, lists, privacy_levels=["public", "followers"]