Gui: [skip ci] const correctness and remove superfluous semicolon
Gui: [skip ci] const correctness and remove superfluous semicolon

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