[BUGFIX] Add missing class to form labels in dashboard

Resolves: #103638
Releases: main, 12.4
Change-Id: Ib5880f2ea62c8d9b54b7db6f6488fc6d5a479827
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83855


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>