[BUGFIX] Fix static access to enumeration constants

Enumeration constants need to be loaded on static access
without requiring a instance before.

Resolves: #64971
Releases: master,6.2
Change-Id: Iaaefe5648ab70743cfc2efc73c81f870833b730d
Reviewed-on: http://review.typo3.org/36794


Reviewed-by: Thomas Maroschik <tmaroschik@dfau.de>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>