~/.xinitrc: Try using external display on startup

This only works if present, but that's fine, when there is no external
display, the command will do nothing.

.xinitrc

@@ -37,6 +37,8 @@ while xsetroot -name "$(~/.config/dwm/status.sh)"; do
	sleep 30
done&
select-display external
exec ~/t/suckless/dwm/dwm
#exec xmonad
#exec gnome-session