[BUGFIX] Make EXT:form wizard work again

Due to the general removal of prototype
the EXT:form wizard does not work
anymore. For now, load prototype
in the wizard again.

The JS for EXT:form needs to be
re-written for 7 LTS of course to remove
the dependency on prototypejs.

Resolves: #63424
Releases: master
Change-Id: Ia2b6bba19e62f3036b3cbba5676ccfce7ed5c0ae
Reviewed-on: http://review.typo3.org/34762
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>