tools: update tools/license-builder.sh

Update tools/license-builder.sh in order to work normally after jinja2
and markupsafe were moved from tools/ to tools/inspector_protocol/ in
an earlier commit.

Refs: https://github.com/nodejs/node/pull/25614

PR-URL: https://github.com/nodejs/node/pull/27362


Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>