core: Fix build break in VdsStaticDAODbFacadeImpl

Patch I56a7b0d3237029e91e7b0cb4bbff18b64e729d9e introduced a call to a
wrong field (wrong capatilization in the property name). This patch
fixes the build break.

Change-Id: Ice2de210d62fb3474133cb45fed75aa22e6ea53c
Signed-off-by: Allon Mureinik <amureini@redhat.com>