[BUGFIX] Ensure a correct default storage is used by default

An editor might not have access to the 1st storage defined (usually
fileadmin). To avoid an exception, an additional check compares the
default storage to the available ones.

Resolves: #103897
Releases: main, 12.4
Change-Id: Ib2d4dc758a2ad95298479122bd7302bb008b3c20
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85424


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>