[BUGFIX] Invalid closure in AbstractMenuContentObject

Issue #58792 introduced a closure in AbstractMenuContentObject.php
which is not PHP 5.3 compatible. Since TYPO3 6.2 must still
support PHP 5.3, and master should be for now.
The closure is replaced by a simple loop.

Resolves: #61721
Releases: 6.2, master
Change-Id: Icc65bf8f8feec1bc62fcf83d8a2f464db3141c0d
Reviewed-on: http://review.typo3.org/32874
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>