Pull request: all: simplify dnssec logic

Closes #3904.

Squashed commit of the following:

commit 5948f0d3519299a1253e388f4bc83e2e55847f68
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Dec 13 17:53:40 2021 +0300

    querylog: imp

commit 852cc7dbdb495a17ff51b99ab12901b846f8be09
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Dec 13 17:44:41 2021 +0300

    querylog: fix entry write

commit 9d58046899f35162596bfc94fe88fa944309b2fd
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Dec 13 16:45:56 2021 +0300

    all: simplify dnssec logic

internal/querylog/qlog_test.go

@@ -269,6 +269,7 @@ func addEntry(l *queryLog, host string, answerStr, client net.IP) {
 			A: answerStr,
 		}},
 	}
+
 	res := filtering.Result{
 		IsFiltered:  true,
 		Reason:      filtering.Rewritten,
@@ -278,7 +279,8 @@ func addEntry(l *queryLog, host string, answerStr, client net.IP) {
 			Text:         "SomeRule",
 		}},
 	}
-	params := AddParams{
+
+	params := &AddParams{
 		Question:   &q,
 		Answer:     &a,
 		OrigAnswer: &a,
@@ -286,6 +288,7 @@ func addEntry(l *queryLog, host string, answerStr, client net.IP) {
 		ClientIP:   client,
 		Upstream:   "upstream",
 	}
+
 	l.Add(params)
 }