Remove slideshow.js

[Cecilia Vela Gurovic]

we are using bootstrap carousel instead, according to first lines in file artefact/file/blocktype/gallery/js/slideshow.js

and couldn't find any reference to this file in the code

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/8991

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/8991
Committed: https://git.mahara.org/mahara/mahara/commit/dd7ca4d47e2c5e331ca8799bf6840a879375a58b
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit dd7ca4d47e2c5e331ca8799bf6840a879375a58b
Author: Cecilia Vela Gurovic <email address hidden>
Date: Fri Jul 6 13:35:31 2018 +1200

Bug 1779600: removing slideshow.js

This js file was loaded when calling
function get_instance_javascript() in
artefact/file/blocktype/gallery/lib.php

The line that included that file was removed when adding bootstrap
There are no calls to the only function defined in slideshow.js,
I think is safe to remove the file.

behatnotneeded

Change-Id: Iddcc6419a06cfccebdd3d243680ee653fd5cae2d