[TASK] Remove special JavaScript handling for ajax.php

Resolves: #68630
Releases: master
Change-Id: I758adef7e87e27db838b7e796de7f6718fcabc5c
Reviewed-on: http://review.typo3.org/42099


Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>