window: Allow popup menu when the window is maximised
window: Allow popup menu when the window is maximised

https://bugs.freedesktop.org/show_bug.cgi?id=66793

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