[FIX] website_slides: fix pdfjs library loading

This is (most likely) related to #32181 which lazy loads most assets.

That caused an issue where the global 'Util' variable from PDFJS can be (depending of which libraries load first)
overridden by the global 'Util' variable of bootstrap.
(See 'lib/bootstrap/js/util.js' and 'lib/pdfjs/src/shared/util.js')

This commit ensures that the global 'Util' variable is set to the one of PDFJS right before it's used.

Eventually, we should update or get rid of one of the two libraries since they're not compatible together,
or make a wrapper that makes them compatible.
In the mean time, this small fix allows not refactoring all of this and can not cause much harm.

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