TrackMate_: WIP redesign: fix buttons when tracking

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMa_: WIP redeisng: fix GUI state after loading

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
TrackMate_: WIP redesign: fix small bug in init filter panel

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>