[TASK] Remove wrong example in ShortcutButton

Resolves: #76415
Releases: master,7.6
Change-Id: I7e5694cfe1c104fdd3cb764af39acad690ffc4b9
Reviewed-on: https://review.typo3.org/48430


Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Tested-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Christian Seifert <christian-f-seifert@gmx.de>
Tested-by: Christian Seifert <christian-f-seifert@gmx.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>