simple-client: Remove unnecessary flush
simple-client: Remove unnecessary flush

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