spacemanager: Fix unlock of allocated files on delete

The code made the wrong assumption that having a pnfs id bound
to the record implies that it cannot be in ALLOCATED. Since assumption
is wrong.

Target: trunk
Require-notes: no
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/6512/