[BUGFIX] Fix option to disable direct file upload

Direct file uploads for FAL fields can be disabled
with ...['appearance']['fileUploadAllowed'] = FALSE

Resolves: #63286
Releases: master, 6.2
Change-Id: I8fd6bd7ab385ba8acc4c7d18fb38507dc8689dbc
Reviewed-on: http://review.typo3.org/34535
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Steffen Müller <typo3@t3node.com>
Tested-by: Steffen Müller <typo3@t3node.com>