[TASK] Use typo3/thumbs.php instead of t3lib/thumbs.php

Change-Id: I5b5d38167ee852770cc042fce7adc995b3934c63
Resolves: #47153
Releases: 6.1
Reviewed-on: https://review.typo3.org/19817
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Nicole Cordes
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn