HPCC-9898 ConfigMgr - Fix thor topology cluster add / del

Signed-off-by: Gleb Aronsky <gleb.aronsky@lexisnexis.com>
Merge pull request #5003 from garonsky/HPCC-9898_cant_delete_thor_cluster_in_topology

HPCC-9898 ConfigMgr - Fix thor topology cluster add / del

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>