Allow HTTPS filtering with trusted self-signed certs

[sfionov]

Currently AdGuard does not filter HTTPS sites with self-signed cert even if it is installed into system store.

There was another issue #1660 where we fixed issue with AG generating incorrect HTTPS certs for such sites.
We fixed it by not allowing such sites to pass verification, as on other systems.

But since some users may want such their sites to be filtered, the proper fix would be fix implementation to generate HTTPS certs for them.

Workaround

To workaround this issue, if you want your local certificate to be filtered by AdGuard:

1. Generate CA Certificate - it should be added to system store.
2. Generate Leaf cert for site - it should be used in local web server.