Revert "Fixed bug #017219: Policy "section/assign" does not uphold subtree limitation"

This reverts commit cef569909821cbf393620244ba48a14328b88c53.
Fix EZP-23341: incorrect subtree limitation check in section/assign
Merge pull request #1071 from joaoinacio/EZP-23341_section_assign_subtree

Fix EZP-23341: incorrect subtree limitation check in section/assign