packaging: Fix syntax error in ovirt-engine.xml.in

Fix misplaced '/' introduced in 48e5a00edb3201f6a2304697fb393031f85e7d91

Change-Id: I6e7edc59bdbe8dcc3c1e1fa533cd29f62d50695e
Signed-off-by: Martin Betak <mbetak@redhat.com>