[BUGFIX] Add namespace declaration in edit form

Change-Id: I7326b8e14aab327aa175359774f6eced6f49dc6d
Resolves: #62293
Reviewed-on: http://review.typo3.org/33345
Reviewed-by: Sebastian Fischer <typo3@evoweb.de>
Tested-by: Sebastian Fischer <typo3@evoweb.de>