Gui: [skip ci] drop the hard limit of 50 allowed workbenches
Gui: [skip ci] drop the hard limit of 50 allowed workbenches

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master