e17/conf_wallpaper: workaraound for preview not being shown, make dialog non-resizable
e17/conf_wallpaper: workaraound for preview not being shown, make dialog non-resizable


SVN revision: 62921

FlorentRevest/Enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,FlorentRevest/Enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,rvandegrift/e,tasn/enlightenment,rvandegrift/e,tasn/enlightenment