usb-device-widget: Call set_active on the toggle_button, not the alignment
usb-device-widget: Call set_active on the toggle_button, not the alignment

Since the gnome HIG-ifying of usb-device-widget.c, the vbox contains
alignments, which in turn contain a toggle_button, so calling
gtk_toggle_button_set_active directly on the vbox-containers childdren is
wrong.

Signed-off-by: Hans de Goede <9fa1be1a5b5729e4c6b404f34c9ce49ff4882fd8@redhat.com>

guodong/spice-gtk,Fantu/spice-gtk,elmarco/spice-gtk,mathslinux/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,dezelin/spice-gtk,mathslinux/spice-gtk,elmarco/spice-gtk,SPICE/spice-gtk,fgouget/spice-gtk,dezelin/spice-gtk,flexVDI/spice-gtk,guodong/spice-gtk,flexVDI/spice-gtk,Fantu/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,dezelin/spice-gtk,dezelin/spice-gtk,Fantu/spice-gtk,mathslinux/spice-gtk,elmarco/spice-gtk,Fantu/spice-gtk,elmarco/spice-gtk,fgouget/spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,mathslinux/spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,guodong/spice-gtk,guodong/spice-gtk