[TASK] Fix static call to non-static method

The WS toolbar calls a method as static which is not

Change-Id: I06c15ba0545177a469f259bf1882a6c13b3585fc
Resolves: #53161
Releases: 6.2
Reviewed-on: https://review.typo3.org/25032
Reviewed-by: Wouter Wolters
Reviewed-by: Steffen Müller
Tested-by: Steffen Müller
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer