[BUGFIX] Proper use of UserSettingsController in ExtdirectTreeCommands

Use the correct object and it's process() method.

Resolves: #66880
Related: #66868
Releases: master
Change-Id: Ibdfd2734b01c7e4fee89dc66cae853d275b1d4bd
Reviewed-on: http://review.typo3.org/39430


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>