Error message not shown when update share fails

### ⚠️ 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. Create a file share via external link
2. Edit the share options and
3. Add a password that does not match the password policy of the server
4. Save

### Expected behaviour

The app should display the "Failed to update share" message of the server.

### Actual behaviour

No error message is shown.

### Android version

15

### Device brand and model

Motorola Edge 50 Neo

### Stock or custom OS?

Stock

### Nextcloud android app version

3.30.8

### Nextcloud server version

29.0.10

### Using a reverse proxy?

No

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

Related issue:
https://github.com/nextcloud/server/issues/50075