fix: error kubectl images

Created by: shaowenchen

I get an error when installing 1.17.9

kubesphere-controls-system     kubectl-admin-56d86b7fd8-25z85                     0/1     ErrImagePull       0          79s

docker pull kubesphere/kubectl:v1.17.0

Error response from daemon: manifest for kubesphere/kubectl:v1.17.0 not found: manifest unknown: manifest unknown