fix 删除任务失败bug

DAPlatform-front/src/components/PublishTask.vue

@@ -120,7 +120,7 @@ export default {
           }
         }).then(res => {
           console.log(res)
-          self.tasks.splice(index, 1)
+          self.publishedTasks.splice(index, 1)
           self.$message({
             message: '删除成功',
             type: 'success'