fix: Start a new shell after --max-size

If 42free would continue, the changes to the environment variables would not be applied yet.

42free.sh

@@ -634,6 +634,7 @@ while (( $# )); do
             ;;
         -m|--max-size)
             change_max_sizes
+            ft_exit $success
             ;;
         -u|--update)
             update