[storage] state pruner: fix stale node index purging logic
[storage] state pruner: fix stale node index purging logic

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core