Helm Chart configmap.yaml has incorrect spelling for CA File

[praxiscode]

When .config.caFile is specified in the values, it gets rendered in the resulting ConfigMap as:

ca-file: {{ $config.caFile }}

This results in the controller complaining about the vCenter certificate.

The correct rendering is:

caFile: {{ $config.caFile }}

This results in the controller trusting the vCenter certificate signed by one of the provided CAs.

"ca-file" is what one would use in a .ini-formatted file. e.g.:

[VirtualCenter "10.0.0.1"]
  ca-file = "/path/to/my/CA/file"

ref: https://cloud-provider-vsphere.sigs.k8s.io/cloud_config

The .config.caFile option is broken as currently implemented.

This is a one-line fix.