drop debug printf

Index: src/Plugins/sidebar-play-queue-time.vala
--- src/Plugins/sidebar-play-queue-time.vala.orig
+++ src/Plugins/sidebar-play-queue-time.vala
@@ -107,7 +107,6 @@ public class Gmpc.Plugins.Sidebar.PlayQueueTime : Gmpc
 
     public void sidebar_pane_construct(Gtk.Grid parent)
     {
-        stdout.printf("sidebar pane construct");
         time_label = new Gtk.Label("play time");
         time_label.set_line_wrap(true);
 
