Client: Disconnect registry listener on destruction
Client: Disconnect registry listener on destruction
If a display outlives a QWaylandClientExtension and a new global is announced we end up delivering an event to a now deleted extension which will crash.
Change-Id: Idc0de40be61a2f7627ab4963e1fe29b22fbf3f04 (cherry picked from commit c4ba37cd2f8cb81b9438b56ac604fc2f3e45083c)