[#828] adm: Fix policy contract deploy

Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>

cmd/frostfs-adm/internal/modules/morph/initialize_deploy.go

@@ -575,8 +575,10 @@ func (c *initializeContext) getContractDeployData(ctrName string, keysParam []an
 			c.Contracts[containerContract].Hash,
 			keysParam,
 			configParam)
-	case proxyContract, policyContract:
+	case proxyContract:
 		items = nil
+	case policyContract:
+		items = []any{nil}
 	default:
 		panic(fmt.Sprintf("invalid contract name: %s", ctrName))
 	}