[BUGFIX] Respect disabled flag in render method of LinkButton

Resolves: #91244
Releases: master
Change-Id: I107cb96ff416211028f9da524500f1ca15c3297c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64393


Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>