[BUGFIX] Correct SQL query for BE user filemounts

Due to a wrong SQL statement, it is not possible
to evaluate any filemounts anymore for be users / groups.

The patch sets a correct SQL statement.

Resolves: #75792
Releases: master
Change-Id: I0f293a4ffc914e95608509e45257a00c938f291a
Reviewed-on: https://review.typo3.org/47796


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>