Don't filter on is_test

Should only be deployed once nyaruka/rapidpro#2319 is deployed

indexer.go

@@ -397,7 +397,7 @@ SELECT org_id, id, modified_on, is_active, row_to_json(t) FROM (
           ) g
    ) as groups
   FROM contacts_contact
-  WHERE is_test = FALSE AND modified_on >= $1
+  WHERE modified_on >= $1
   ORDER BY modified_on ASC
   LIMIT 500000
 ) t;