[TASK] Improve styling of sysaction toolbar items

The sys_action items need a restyling.

Resolves: #63480
Releases: master
Change-Id: I8b0c52924e9291eb3520c76b19be86ebba1f1ddd
Reviewed-on: http://review.typo3.org/34865
Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Benjamin Kott <info@bk2k.info>
Tested-by: Benjamin Kott <info@bk2k.info>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>