[BUGFIX] Visualize CEs with surrounding box-shadow

In the backend CEs are elevated by a surrounding box-shadow.

This box-shadow was clipped off on top, left and right side.

Resolves: #103381
Releases: main, 12.4
Change-Id: I3052ff7ced18e509aefb2f05c6b1bde8725572b5
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83445


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Garvin Hicking <gh@faktor-e.de>
Reviewed-by: Garvin Hicking <gh@faktor-e.de>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>