[homeassistant] fix pvc for postgresql

[Brice187]

Signed-off-by: Lars Kerick Brice187@users.noreply.github.com

Description of the change

The creation of the PVC for bitnami postgresql helm chart does not work in the current implementation. Fixed values.yaml template

Benefits PVC gets created correctly following the rules of parent repository

Possible drawbacks

No known drawbacks

Additional information

Checklist

• [x] Title of the PR starts with chart name (e.g. [home-assistant])
• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Chart artifacthub.io/changes changelog annotation has been updated in Chart.yaml. See Artifact Hub documentation for more info.
• [x] Variables have been documented in the values.yaml file.