User can't change his/her own password

## Describe the bug

[k8s/helm/deployment/Built-in User Management]

Testing ocis on k8s, deployed via helm and ocis-charts.
When logged in a simple example instance, I noticed that i can not change my own password!

Admin, can change it in the Admin Settings, but the user (even admin) can not change it in the **user prefs** ...

## Steps to reproduce
1. `helm install --values values-example.yml ocis ./charts/ocis `
2. log in
3. `"RightTopCorner: My Account -> Prefs -> Change Password"`

## Expected behavior
Password changed

## Actual behavior
```
Failed to change password
Copy the following information and pass them to technical
support to troubleshoot the problem: X-Request-Id: 4e8....

```

## Setup
values-example.yml is:

```console
---
image:
repository: docker.io/owncloud/ocis
tag: "7.0.1"

externalDomain: ocis.kube.owncloud.test

replicas: 1

ingress:
enabled: true
ingressClassName: nginx
annotations:
nginx.ingress.kubernetes.io/proxy-body-size: 1024m
tls:
- secretName: ocis-tls-certificate
hosts:
- ocis.kube.owncloud.test

logging:
level: debug

insecure:
oidcIdpInsecure: true
ocisHttpApiInsecure: true
```

## Additional context

Tested with 7.0.1 and 7.1.0

Basically straight test example ... do I miss something?