3.29.0 doesnt connect and spams with "No client certificate found" dialog

### ⚠️ Before posting ⚠️

- [X] This is a **bug**, not a question or an enhancement.
- [X] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [X] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [X] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

connect to server via android app 3.29.0

### Expected behaviour

- be able to connect to server
- client certificate handling should be imho optional
- documentation how to handle client certificate e.g. if using LetsEncrypt for nextcloud server is preferable

### Actual behaviour

I can not connect and get a "No client certificate found" which i can cancel, but then the dialog appears again

### Android version

14

### Device brand and model

google pixel 7a

### Stock or custom OS?

Stock

### Nextcloud android app version

3.29.0

### Nextcloud server version

27.1.4

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

_No response_

### Additional information

reverse proxy is traefik