[BUGFIX] PHP 8 warning in ContentObjectRenderer::editIcons

Added a null coalescing operator when assigning value to $editUid.

Resolves: #101602
Releases: 11.5
Change-Id: Ie19fa72032c57c824322a319deafc441fdb9319e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80427


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Benni Mack <benni@typo3.org>