[BUGFIX] Wrong signal class name in DatabaseTreeDataProvider

In the emitPostProcessTreeDataSignal of the DatabaseTreeDataProvider
the namespace for the SlotDispatcher to get the class name is wrong.
TableConfiguration is used twice here. This patch removes the doubled
namespace.

Releases: master
Resolves: #65360
Change-Id: Iff4f02ad63cc0f7ed6f0176a624aa293c5b1f4cc
Reviewed-on: http://review.typo3.org/37252


Reviewed-by: Frank Nägler <typo3@naegler.net>
Tested-by: Frank Nägler <typo3@naegler.net>
Reviewed-by: Helmut Hummel <helmut.hummel@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>