The expand/collapse context menu actions are missing icons.

Change-Id: I3ae86ff0a4de225854d173a485a0a8991adccd22
Resolves: #M17924
Reviewed-on: http://review.typo3.org/1130


Reviewed-by: Stefan Galinski <stefan.galinski@gmail.com>
Tested-by: Stefan Galinski <stefan.galinski@gmail.com>