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/http.go

@@ -19,10 +19,10 @@ import (
 )
 
 type qlogConfig struct {
-	Enabled bool `json:"enabled"`
 	// Use float64 here to support fractional numbers and not mess the API
 	// users by changing the units.
 	Interval          float64 `json:"interval"`
+	Enabled           bool    `json:"enabled"`
 	AnonymizeClientIP bool    `json:"anonymize_client_ip"`
 }