bump to app version 25

The version has bumped again to 25.

This works for me now: in file `util.py`:

```python
SESSION.headers = {
'Accept': 'application/json;image/webp',
'Accept-Encoding': 'gzip',
'User-Agent': 'VTM_GO/25.26.423 (be.vmma.vtm.zenderapp; build:20932; Android TV 28) okhttp/4.12.0',
'x-app-version': '25',
'lfvp-device-segment': 'TV>Android',
}
```