tests: remove "draw drawable" button from testwindows test

draw_drawable is gone soon. And testing the proper functioning of
drawing calls is Cairo's job anyway.

tests/testwindows.c

@@ -217,22 +217,6 @@ add_window_clicked (GtkWidget *button,
   update_store ();
 }
 
-static void
-draw_drawable_clicked (GtkWidget *button, 
-		       gpointer data)
-{
-  GdkGC *gc;
-  gc = gdk_gc_new (darea->window);
-  gdk_draw_drawable (darea->window,
-		     gc,
-		     darea->window,
-		     -15, -15,
-		     40, 70,
-		     100, 100);
-  g_object_unref (gc);
-}
-
-
 static void
 remove_window_clicked (GtkWidget *button, 
 		       gpointer data)
@@ -1047,16 +1031,6 @@ main (int argc, char **argv)
 			     3, 4);
   gtk_widget_show (button);
 
-  button = gtk_button_new_with_label ("draw drawable");
-  gtk_box_pack_start (GTK_BOX (vbox),
-		      button,
-		      FALSE, FALSE,
-		      2);
-  gtk_widget_show (button);
-  g_signal_connect (button, "clicked", 
-		    G_CALLBACK (draw_drawable_clicked), 
-		    NULL);
-
   button = gtk_button_new_with_label ("Add window");
   gtk_box_pack_start (GTK_BOX (vbox),
 		      button,