[BUGFIX] Use the correct PreviewRenderer as fallback

When there is no specific preview renderer defined for
a given subtype, the type-specific renderer can only
be used if it's not an array. Otherwise, the default
preview renderer defined in TCA crtl should be used.

Releases: master, 10.4
Resolves: #92758
Change-Id: Ia88d262f52ddac174cbe6750c591898c84872a89
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/66413


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Benni Mack <benni@typo3.org>