[BUGFIX] Bring back missing expand/collapse icons

Resolves: #62681
Releases: master
Change-Id: Id077a00a83f11e2693c7a3da8bc284662dabc436
Reviewed-on: http://review.typo3.org/33922
Reviewed-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Tested-by: Andreas Fernandez <andreas.fernandez@aspedia.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>