[BUGFIX] Enable action buttons in Linkvalidator module

The action buttons in the Linkvalidator module are
disabled in case all checkboxes are unchecked.

In case one of the checkboxes changes its state,
the state of the corresponding action button is
now properly updated.

Resolves: #103100
Releases: main
Change-Id: I9a479df294da32f30600287ac76fe7252a23cb1d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82896


Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>