[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
Change-Id: Ic93ec8047d2db9205fdf10bb4bce63b1559ca728
Reviewed-on: http://review.typo3.org/34979
Reviewed-by: Steffen Müller <typo3@t3node.com>
Tested-by: Steffen Müller <typo3@t3node.com>