Fix of #4441    SearchDialog: Select first item in the lit, if search_list has at least one item
Fix of #4441
   SearchDialog: Select first item in the lit, if search_list has at least one item

prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r