Correctly write `AdGuard` in name of installer file

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

- [X] I am running the latest version
- [X] I checked the documentation and found no answer
- [X] I checked to make sure that this issue has not already been filed

### AdGuard VPN version

2.1.2 (1000)

### Operating mode

VPN

### Environment

```markdown
- OS: Windows 11 v. 22H2
- Other network-level software: AdGuard
```

### Issue Details

Steps to reproduce:
1. Download installer from https://adguard-vpn.com/en/windows/overview.html

### Expected Behavior

The file name will be as in the installer for macOS: `AdGuardVPNInstaller`

### Actual Behavior

In the name of the installer file, `adguard` is written entirely in small letters.

### Screenshots

Screenshot:

### Additional Information

_No response_