Core/VoidStorage: Fix SMSG_VOID_STORAGE_CONTENTS structure

* If you have items stored in void storage with owner guid, the void storage appear empty or partitial emplty
Merge pull request #11455 from Dekadencee/fix_void_storage

[4.3.4] Core/VoidStorage: Fix SMSG_VOID_STORAGE_CONTENTS structure
Merge remote-tracking branch 'Trinity/4.3.4' into 4.3.4