Cannot sync a folder containing the ":" character

### ⚠️ 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. In the nextcloud server, create a `test : test` folder containing a `test` empty file
2. In the nextcloud android client, manually sync this folder

### Expected behaviour

The file should be locally downloaded (with the green ✅ mark)

### Actual behaviour

File is marked as "in progress" (blue cycling arrows ♻). Then it disappear, leaving only a "error while downloading" notification. Local folder is indeed missing.

Changing the folder name with a `test - test` name does fix the situation

### Android version

14

### Device brand and model

Fairphone 5

### Stock or custom OS?

Stock

### Nextcloud android app version

3.31.1

### Nextcloud server version

30.0.10

### Using a reverse proxy?

No

### Android logs

Hard to fetch logs (standard version, not rooted, no adb)

### Server error logs

```bash
I don't have access to server logs.
```

### Additional information

Note that WebDAV access on this `test : test` folder _does_ work. Content is correctly listed in Nextcloud app. It's only the sync that fails.