cherry-pick: querylog: fix oldest calc

Updates #4591.

Squashed commit of the following:

commit 70b70c78c85311363535536c7ea12336b21accf8
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed May 25 17:35:54 2022 +0300

    querylog: fix oldest calc

internal/querylog/qlog_test.go

@@ -285,8 +285,8 @@ func addEntry(l *queryLog, host string, answerStr, client net.IP) {
 		Answer:     &a,
 		OrigAnswer: &a,
 		Result:     &res,
-		ClientIP:   client,
 		Upstream:   "upstream",
+		ClientIP:   client,
 	}
 
 	l.Add(params)