widget-factory: Fix multi-selection example
widget-factory: Fix multi-selection example

It turns out that activate-on-single-click interferes with the
expected multi-selection behavior. Turn it off, since there's nothing
to activate in this list, anyway.

jadahl/gtk,ahodesuka/gtk,davidgumberg/gtk,grubersjoe/adwaita,jigpu/gtk,davidgumberg/gtk,grubersjoe/adwaita,jadahl/gtk,Adamovskiy/gtk,ahodesuka/gtk,Adamovskiy/gtk,jadahl/gtk,davidgumberg/gtk,grubersjoe/adwaita,jessevdk/gtk,jadahl/gtk,jigpu/gtk,Lyude/gtk-,alexlarsson/gtk,jigpu/gtk,jigpu/gtk,chergert/gtk,davidgumberg/gtk,jigpu/gtk,ahodesuka/gtk,Lyude/gtk-,jessevdk/gtk,alexlarsson/gtk,jessevdk/gtk,ahodesuka/gtk,chergert/gtk,jigpu/gtk,jessevdk/gtk,jessevdk/gtk,alexlarsson/gtk,alexlarsson/gtk,chergert/gtk,Lyude/gtk-,davidgumberg/gtk,Adamovskiy/gtk,Adamovskiy/gtk,chergert/gtk,Lyude/gtk-,Lyude/gtk-,jadahl/gtk,jessevdk/gtk,ahodesuka/gtk,Lyude/gtk-,alexlarsson/gtk,chergert/gtk,davidgumberg/gtk,chergert/gtk,chergert/gtk,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,jessevdk/gtk,davidgumberg/gtk,alexlarsson/gtk,jadahl/gtk,jadahl/gtk,Lyude/gtk-,Adamovskiy/gtk,grubersjoe/adwaita,ahodesuka/gtk,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,grubersjoe/adwaita,davidgumberg/gtk,alexlarsson/gtk,chergert/gtk,Lyude/gtk-,Adamovskiy/gtk,jigpu/gtk,grubersjoe/adwaita,Adamovskiy/gtk,ahodesuka/gtk,alexlarsson/gtk