Pull request: 2875 fix client filtering settings

Merge in DNS/adguard-home from 2875-client-filtering to master

Updates #2875.

Squashed commit of the following:

commit b3b9582b7dde826005ba79d499ed7e82af067e93
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Mon May 24 14:22:29 2021 +0300

    all: use atomic, log changes

commit 9304d8b96d0d064d7741c85165ab885f5547fd4c
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Mon May 24 13:43:22 2021 +0300

    all: fix client filtering settings

CHANGELOG.md

@@ -27,6 +27,10 @@ released by then.
 
 - Go 1.16 support.  v0.108.0 will require at least Go 1.17 to build.
 
+### Fixed
+
+- Incorrect client-based filtering applying logic ([#2875]).
+
 ### Removed
 
 - Go 1.15 support.