[BUGFIX] Fix page permissions SQL clause in BackendConfigurationManager

Instead of passing the simple value "1" to QueryGenerator->getTreeList()
use a page permission clause created using $BE_USER->getPagePermsClause()
when determining the recursive storage pids. Passing the unprocessed value
"1" causes invalid SQL statements and does not perform any access checks.

Releases: master, 7.6
Resolves: #75912
Change-Id: I6edadd627c0a9c01a78c3cb55805455fed710d14
Reviewed-on: https://review.typo3.org/48220


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>