Add backlight control as a scroll function

This adds backlight control of monitor through scrolling.
Requires "light" pacakage and that the user can run "sudo light" without a password, easily done through sudoers edit.
Enjoy less eye strain :)

.local/bin/statusbar/battery

@@ -10,6 +10,8 @@ case $BLOCK_BUTTON in
 🔌: charging
 ⚡: charged
 ❗: battery very low!" ;;
+	4) sudo light -A 10 ;;
+	5) sudo light -U 10 ;;
 	6) "$TERMINAL" -e "$EDITOR" "$0" ;;
 esac