[TASK] Explicitly style gap between Content Element header icons

Resolves: #102812
Releases: main, 12.4
Change-Id: I43ea655938b8e4e691359bd22113c4f02ea71036
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82389


Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Nikita Hovratov <nikita.h@live.de>