`overrideConfigExistingSecret` in values.yaml instead of `overrideConfigExistingSecretName`

[jseiser]

values.yaml: https://github.com/small-hack/vouch-helm/blob/main/charts/vouch/values.yaml#L118
deployment: https://github.com/small-hack/vouch-helm/blob/main/charts/vouch/templates/deployment.yaml#L63C37-L63C69

I imagine the values.yaml should be adjusted to reflect the actual value.

[jessebot]

sorry for the exterme delay. Fixing now!