fix(logs): show all matched logs when --since filter specified

cmd/uc/machine/logs.go

@@ -69,6 +69,10 @@ func runLogs(ctx context.Context, uncli *cli.CLI, services []string, opts logs.O
 	if err != nil {
 		return err
 	}
+	tail, err := opts.TailLines()
+	if err != nil {
+		return err
+	}
 
 	if len(services) == 0 {
 		services = []string{api.SystemServiceUncloud}
@@ -80,11 +84,6 @@ func runLogs(ctx context.Context, uncli *cli.CLI, services []string, opts logs.O
 		}
 	}
 
-	tail, err := logs.Tail(opts.Tail)
-	if err != nil {
-		return err
-	}
-
 	c, err := uncli.ConnectCluster(ctx)
 	if err != nil {
 		return fmt.Errorf("connect to cluster: %w", err)