App opens non-default browser "New Tab" when login URL is unreachable

### Please answer the following questions for yourself before submitting an issue.

- [x] I checked the [knowledge base](https://adguard-vpn.com/kb/) and found no answer
- [x] I checked to make sure that this issue has not already been filed

### AdGuard VPN version

2.9.1

### Environment

```markdown
- OS: Windows 10, 22H2 (OS build 19045.6456)​​
- Other network-level software: Dr.Web Security Space
```

### Which DNS server do you use?

AdGuard DNS

### Custom DNS

_No response_

### Use Wintun

- [ ] yes, I do

### Issue Details

Steps to reproduce:
1. Run uninstall (Select Remove all settings). Finish procedure
2. Reboot
3. Install new or same ag vpn version.
4. Try to login.

### Expected Behavior

Application open default browser with login page.

### Actual Behavior

MS Edge(not a default browser) opened with empty new tab each time when click on Login(Reopen) button.

### Screenshots

_No response_

### Additional Information

_No response_