terraform(cloudflare): set default for `kube_worker_ips`
terraform(cloudflare): set default for `kube_worker_ips`

If not set, this causes Terraform to error. This is a problem for those

coming from 1.0.x Terraform configurations.



Fixes #1329
KaGeN101/mantl,mantl/mantl,bitium/mantl,datascienceinc/mantl,CiscoCloud/mantl,CiscoCloud/microservices-infrastructure,phnmnl/mantl,sehqlr/mantl,sehqlr/mantl,CiscoCloud/microservices-infrastructure,KaGeN101/mantl,bitium/mantl,datascienceinc/mantl,mantl/mantl,phnmnl/mantl,CiscoCloud/mantl