[BUGFIX] Use Sprite Icons for ShortcutMenu

The shortcut menu still uses
hardcoded img tags to typo3/gfx/.

Resolves: #63301
Releases: master
Change-Id: I3d37008b5723644a236af20a9a59abb239ad3684
Reviewed-on: http://review.typo3.org/34553


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>