Make AdGuard's VPN connection shared with ChromeOS

AdGuard local VPN not functioning properly on Chromebook; with ChromeOS m76 (released this past week) the local VPN of AdGuard stopped being shared with ChromeOS. The VPN used by an OpenVPN client is shared with ChromeOS just fine. The AdGuard VPN only works within the Android environment while previously it could be shared systemwide and block ads on both Android and ChromeOS.

**Added by @ameshkov:**

Investigation results and the temporary solution: https://github.com/AdguardTeam/AdguardForAndroid/issues/3008#issuecomment-568906177

Possible solution: do not exclude system apps (uid=1000) on ChromeOS

In any case, the filtering will be limited as all ChromeOS apps will look like "system apps" to AdGuard, therefore it won't be able to filter HTTPS there.

Original issue details

### Issue Details

- **AdGuard version:**
3.2.130
- **Filtering mode:**
VPN
- **Operating system and version:**
ChromeOS m76
- **Root access:**
n/a

### Expected Behavior

AdGuard should work for both Android and ChromeOS apps

### Actual Behavior

AdGuard VPN works only for Android environment installed into ChromeOS

### Additional Information

Logs here: 2288209