Streaming video when using "Key type: user key" encryption don't work if media is not shared.

### ⚠️ 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

1. Enable Per User encryption on server.
2. Try to stream any mp4 by tapping on it in nextcloud app, or use the 3 dots and select stream.

### Expected behaviour

The file should start buffering and stream

### Actual behaviour

You get an error with "can't read media file". And a log entry on server that the file can't be decrypted.

### Android version

14

### Device brand and model

Xperia 1V

### Stock or custom OS?

Stock

### Nextcloud android app version

3.30.6

### Nextcloud server version

30.0.4

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

```bash
{"reqId":"A6YsLBJh5FFilUiRmD5B","level":3,"time":"2024-12-25T23:06:30+00:00","remoteAddr":"_hidden_","user":"--","app":"no app in context","method":"GET","url":"/remote.php/direct/9KxmcOiIpnCDPFn8r0vWu5XW3oYLui2eYdtykhVjWnqIlXylIJQRTPivlHph","message":"Cannot decrypt this file, probably this is a shared file. Please ask the file owner to reshare the file with you.","userAgent":"Mozilla/5.0 (Android) Nextcloud-android/3.30.6","version":"30.0.4.1","data":[],"id":"676c90e388c6d"}
```

### Additional information

It looks like the app tries to get a direct link to the file in question and this direct link can not decrypt the file. Same result if i e.g. try to stream it to MX Player.

A workaround i found is if i first share the file with a public link, then it works, i can both play it in nextcloud app, and stream to MX Player. But if i remove the public link, it fails again to decrypt the file.

So i guess the app creates some kind of temporary link that can't decrypt the file. And i don't now if this is a feature of the Nextcloud server, and the error is on that side, or if it is the app.

Streaming from Web UI works fine.