Update hlwm panel

- Use lemonbar-xft instead of lemonbar
- Use the same font sizing than in ~/.Xdefaults

xdg-config-dir/herbstluftwm/autostart

@@ -168,7 +168,7 @@ if [ -f ~/.config/herbstluftwm/herbstpanel.sh ]; then
 		hc pad "$m" 0 0 $bar_height 0
 		hc monitor_rect "$m" | {
 			read -r x y w h
-			y=$(($y + $h - $bar_height - 1))
+			y=$(($y + $h - $bar_height))
 			printf "%s\t%u\t%u\t%u\t%u\n" \
 			    "$m" "$x" "$y" "$w" $bar_height
 		}