Dynamic scripts containing const and let variables are not exposed as global

[benoit74]

This is the same issue as webrecorder/wombat#82, which has been partially solved in webrecorder/wabac.js#128 (and few other commits).

Note that webrecorder/wabac.js#156 is still not addressed.

We can encounter this issue in the wild on https://geo.libretexts.org/Courses/Coastline_College/An_Introduction_To_Geology_-_Coastline_College/01%3A_Understanding_Science/1.01%3A_What_is_Science where reuse.js is exposing LibreEditor and LibreTexts.

@ikreymer: is it normal that this is not saved "already rewritten" in the WARC by wombat?

[benoit74]

Nota: webrecorder/wabac.js#156 is not encountered on libretext real use-case, importing the fix already implemented in wabac inside warc2zim would be sufficient (but I'm not sure about how to do it properly for now, I've only hacked it to check wether it was the real issue and what it would solve).