shell: Remove lock/unlock listeners on shutdown
shell: Remove lock/unlock listeners on shutdown

Fantu/compositor-spice,krezovic/weston,udoprog/weston,jonnylamb/weston,xorgy/weston,jonnylamb/weston,giucam/weston,mchalupa/weston,Fantu/compositor-spice,eyolfson/weston,Fantu/compositor-spice,krezovic/weston,sir-murray/weston,eyolfson/weston,kwm81/weston,sir-murray/weston,Gnurou/weston,Tarnyko/weston-xdg_surface_present,Gnurou/weston,udoprog/weston,giucam/weston,xorgy/weston,kwm81/weston,Tarnyko/weston-xdg_surface_present,mchalupa/weston