Adapt single inh criteria more specifically

Adapt single inh criteria more specifically

Fixed issue where when using single-table inheritance in conjunction with a
joined inheritance hierarchy that uses "with polymorphic" loading, the
"single table criteria" for that single-table entity could get confused for
that of other entities from the same hierarchy used in the same query.The
adaption of the "single table criteria" is made more specific to the target
entity to avoid it accidentally getting adapted to other tables in the
query.

Change-Id: Ia9f915a4b01e8bb9cee365c4c70e00c626f103c4
Fixes: #4454