vsxu: re-enable window decorations

modules/visualization/vsxu.cpp

@@ -130,6 +130,7 @@ static int Open( vlc_object_t * p_this )
     vout_window_cfg_t cfg;
 
     memset( &cfg, 0, sizeof(cfg) );
+    cfg.is_decorated = true;
     cfg.width = var_InheritInteger( p_filter, "vsxu-width" );
     cfg.height = var_InheritInteger( p_filter, "vsxu-height" );