[BUGFIX] Replace shortcut item icons with sprites

If somebody adds shortcuts with several
types, e.g. while editing the contents of a file
or the RTE in full-screen mode or just within
a module, you notice that there are missing
icons and sprites.

The patch changes the image tag to sprite icons.

Resolves: #63319
Releases: master
Change-Id: I5e2bfc127ee5436212303301b158f01c4cf8b61f
Reviewed-on: http://review.typo3.org/34597
Reviewed-by: Stefan Froemken <froemken@gmail.com>
Tested-by: Stefan Froemken <froemken@gmail.com>
Reviewed-by: Christoph Hofmann <typo3@its-hofmann.de>
Tested-by: Christoph Hofmann <typo3@its-hofmann.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>