hlwm: user lemonbar instead of lemonbar-xft

At least lemonbar is maintained every now and then. lemonbar-xft has
been archived for almost a year already.

xdg-config-dir/herbstluftwm/herbstpanel.sh

@@ -77,8 +77,8 @@ right=
 		;;
 	esac
 	printf "%s%s%s\n" "$left" "$center" "$right"
-done | lemonbar-xft -b -g "$geometry" \
-    -B "$hlwm_background" -F "$hlwm_foreground" -f "$hlwm_face" &
+done | lemonbar -b -g "$geometry" \
+    -B "$hlwm_background" -F "$hlwm_foreground" -f "$hlwm_font" &
 
 herbstclient -w reload
 kill 0