Revert "Fix renaming files in the root folder of a MappedLocal storage"

This reverts commit 0895324553167ebf4bc87ef83c86285edd8047cb.
Revert "files: storage: rename should check parent directories of old and new files"

This reverts commit a163b185ab03bd9816766250c6ae06df38625261.
Merge pull request #9695 from owncloud/revert-backport-9550-stable7

Revert backport 9550 stable7