[BUGFIX] Check default storage first to find default upload folder

Resolves: #65040
Releases: master, 6.2
Change-Id: I14d6d362db1796c90b03254f6339cb131f152a45
Reviewed-on: http://review.typo3.org/37159


Reviewed-by: Viktor Livakivskyi <invisible.kinder@gmail.com>
Tested-by: Viktor Livakivskyi <invisible.kinder@gmail.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>