compositor: Always allow owner of pointer surface to change the hotspot
compositor: Always allow owner of pointer surface to change the hotspot

Make pointer_set_cursor() succeed if a client that doesn't have pointer
focus but is the owner of the current pointer surface calls it.

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