Syncing a folder does not include files in subfolders

### ⚠️ 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

Choose a folder and select Sync

### Expected behaviour

All files in the folder and subfolders should be available offline

### Actual behaviour

Only files directly under the folder gets synced. All subfolders are ignored.

### Android version

15

### Device brand and model

OnePlus Nord 4

### Stock or custom OS?

Stock

### Nextcloud android app version

3.32.0

### Nextcloud server version

31.0.6

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

_No response_