[TASK] Remove prototype.js from FileList

The filelist still loads prototype even though
it is not used anymore.

Resolves: #66002
Releases: master
Change-Id: I6a3b68c078571aadb5b1eb80ed63fca0870e0764
Reviewed-on: http://review.typo3.org/38139


Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>