xwm: Use window->x/y for override redirect surfaces
xwm: Use window->x/y for override redirect surfaces

window->x/y is the coordinate of the top-level surface (whether that's
the frame window or an override-redirect window) and the wayland surface
should be placed there, without the t->margin offset.

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