tasklist: do not queue_resize from size_allocate
From GTK documentation: https://developer.gnome.org/gtk3/stable/GtkWidget.html#gtk-widget-queue-resize
Note that you cannot call gtk_widget_queue_resize() on a widget from inside its implementation of the GtkWidgetClass::size_allocate virtual method. Calls to gtk_widget_queue_resize() from inside GtkWidgetClass::size_allocate will be silently ignored.