Do not show 7+ HTTPS filtering warning when the certificate is in the system store #1855

Relevant discussion:
https://forum.xda-developers.com/showpost.php?p=76423776&postcount=3143

Steps to reproduce

1. Move the certificate to the system store
2. Go to "Apps management"
3. Find an app there
4. Uncheck the HTTPS filtering flag
5. Check it again

Expected behavior

The checkbox value changes with no questions asked

Actual behavior

AdGuard shows the HTTPS filtering warning despite the certificate is in the system store.

Your environment

• Adguard version: 2.12.4 nightly
• Adguard filtering mode: VPN
• Operating system and version (e.g. Android 7.1.2): any Android 7+
• Rooted