[backend] Fix typo

beat/web/backend/utils.py

@@ -285,7 +285,7 @@ def setup_backend(d):
     update_qnames = current_qnames.intersection(config_qnames)
     for name in update_qnames:
 
-        queue = Queues.objects.select_for_update().get(name=name)
+        queue = Queue.objects.select_for_update().get(name=name)
         attrs = d['queues'][name]
 
         # 10.1 Update queue parameterization: running jobs will be unaffected