xwayland: Correct input for undecorated clients
xwayland: Correct input for undecorated clients

We were correctly handling decorated and fullscreen clients, but left
uninitialized values in the input region for undecorated clients. Fix
this behavi-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

Reviewed-by: Pekka Paalanen <0f6ae7001e34c37b02fb2c1c2573ddf8f442136a@collabora.co.uk>

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