undefined error when editing cron parameters of DevOps

Created by: shaowenchen

Describe the bug

There is an undefined parameter in URL when editing the Build Trigger.

Versions used(KubeSphere/Kubernetes)

KubeSphere: 3.0.0 Kubernetes: (If KubeSphere installer used, you can skip this)

To Reproduce

edit Build Trigger

/assign @harrisonliu5