All tenants are being created in the same database/schema

The Traction ACA-Py agent is started with the setting `"wallet_scheme":"DatabasePerWallet"` in the wallet storage configuration: this is expected to cause each tenant to be created and live in their own database in the wallet. However, it appears that all tenants are actually being created inside the same `multitenant_sub_wallet` database at this time.

Unsure on whether this issue is in Traction or ACA-Py, we should audit the problem and follow-up in the appropriate repository to find a solution.