Auto-Uploaded WhatsApp Videos Timestamp is Wrong

### ⚠️ 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

- Configure auto-upload for WhatsApp.
- Grant storage access permissions.
- Take a video.
- See in the web UI that the timestamp is wrong, and set close to **1904-01-01 00:00:00**. The exact hour can change.

That is only for WhatsApp videos.

### Expected behaviour

Correct timestamp is preserved.

### Actual behaviour

A timestamp close to **1904-01-01 00:00:00** is wrongly set.

### Android version

13

### Device brand and model

Samsung Galaxy S20 FE

### Stock or custom OS?

Stock

### Nextcloud android app version

3.32.2

### Nextcloud server version

31.0.7

### Using a reverse proxy?

Yes

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

The filename is formatted as "VID-20250709-WA0001.mp4."
If the exact timestamp is lost, one could imagine writing a script that would at least assign the correct date to the videos.