clients/editor.c: Draw cursor at correct verical position
clients/editor.c: Draw cursor at correct verical position

With this patch, the editor cursor now moves up and down correctly
instead of having the top part stuck on the first line.

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