[TASK] Make file_newfolder.php dispatched

Use dispatching for file_newfolder.php

Resolves: #61215
Releases: 6.3
Change-Id: If2ae411543b2a543c828cf029f2596666e0a1296
Reviewed-on: http://review.typo3.org/32405
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>