[TASK] Unify autoSizeMax logic

This unifies the approach of calculating the size attribute value when
having autoSizeMax set.

Resolves: #94476
Releases: master
Change-Id: I4477b5376c78f1288d586522887ea4027dd0e96e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/69712


Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Benni Mack <benni@typo3.org>