[teslamate] Update teslamate postgres persistence values

[Vikaspogu]

Signed-off-by: vikaspogu vikaspoguadf@gmail.com

Description of the change

Update the values of PostgreSQL persistence in accordance with bitnami chart https://github.com/bitnami/charts/blob/master/bitnami/postgresql/values.yaml

Benefits

Possible drawbacks

Applicable issues

• fixes #

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.
• [ ] Variables have been documented in the values.yaml file.