exports: js files are fetched from the wrong dir in configurable theme

[Cecilia Vela Gurovic]

when generating the 'All my data' export the html files created have the wrong path for the javascript files, if the logged in user exporting the data belongs to an institution using a configurable theme

To replicate
- have an institution with configurable theme set up
- have a member of that institution and login as that user
- go to User menu -> Manage -> Export
- select 'All my data' and click on 'Generate export'
- extract the downloaded .zip file is a local directory
- open the HTML/index.html file
- inspect the code in the browser

Expected result: the path of the .js file, e.g. jquery.js, should be pointing to the HTML/static/theme/raw but the theme.js file that is located in HTML/static/theme/custom
Actual result: the path of some of the .js file (not theme.js) starts with HTML/static/theme/custom

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11218
Committed: https://git.mahara.org/mahara/mahara/commit/a6af81231c2746fdf7c3ed7a12cf8e689bc21f42
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit a6af81231c2746fdf7c3ed7a12cf8e689bc21f42
Author: Cecilia Vela Gurovic <email address hidden>
Date: Thu Sep 3 17:22:49 2020 +1200

Bug 1894026: fetch js from correct folder in html exports

behatnotneeded

Change-Id: I6a58c9c9a1f314ae17b838aa0ca72f201caec351