[TASK] Bring SpriteIcons to TaskCenter - fix styles

Resolves: #63260
Releases: master
Change-Id: I087f6348d721339c1d1a7be4dc114f730f42243e
Reviewed-on: http://review.typo3.org/34802
Reviewed-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Tested-by: Mathias Schreiber <mathias.schreiber@wmdb.de>
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>