[BUGFIX] Repair TCA thumbnail view

With activated thumbnail option in ctrl section
of a TCA table configuration the thumbnails are not
rendered.

Resolves: #75496
Releases: master,7.6
Change-Id: I8ef40ffe300bf14474a3575d6fef4802b26c42e1
Reviewed-on: https://review.typo3.org/47562


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Frans Saris <franssaris@gmail.com>
Tested-by: Frans Saris <franssaris@gmail.com>