spicy: Stop using SpiceDisplay's deprecated clipboard methods
spicy: Stop using SpiceDisplay's deprecated clipboard methods

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

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