gtkicontheme: Fix a missing case where we forget to set is_svg
gtkicontheme: Fix a missing case where we forget to set is_svg

When duplicating the icon_info, we forgot to set is_svg. This meant that
any application that used gtk_icon_info_load_icon_async wouldn't have
is_svg set properly.

This fixes blurry icons in the gnome-shell app picker.

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