send queue leave webhook when dequeued

lib/tasks/enqueue.js

@@ -277,6 +277,7 @@ class TaskEnqueue extends Task {
         const {lengthOfList} = cs.srf.locals.dbHelpers;
         const members = await lengthOfList(this.queueName);
         this.dequeued = true;
+
         cs.performQueueWebhook({
           event: 'leave',
           queue: this.data.name,