channel-webdav: Remove extra SpiceWebdavChannel parameter
channel-webdav: Remove extra SpiceWebdavChannel parameter

Acked-by: Jonathon Jongsma <c7254805a17bd5c41e24c3a278fcbf3afcdfb0fa@redhat.com>

flexVDI/spice-gtk,fgouget/spice-gtk,fgouget/spice-gtk,flexVDI/spice-gtk,fgouget/spice-gtk