If we pass the active property to the constructor do_clicked seem
to get called. Before chaining up to the Gtk.RadioToolButton
constructor we need to initialize the variable.
This is a followup of 5a1b380dd6
Signed-off-by: Simon Schampijer <simon@laptop.org>
Tested-by: Gonzalo Odiard <gonzalo@laptop.org>
Acked-by: Manuel Quiñones <manuq@laptop.org>