[BUGFIX] Correct bookmark form styling

Adjust the whitespace of the bookmark
edit form in the backend toolbar, to look
more aligned to the other dropdowns.

Resolves:  #98514
Releases: main
Change-Id: If25101e0ceb3568d086c38f5b4f193be90b58620
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75972


Tested-by: core-ci <typo3@b13.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>