Fixing the broken `TestAccAzureRMServiceBusTopic_enablePartitioningPremium` test:
Fixing the broken `TestAccAzureRMServiceBusTopic_enablePartitioningPremium` test:

```
$ acctests azurerm TestAccAzureRMServiceBusTopic_enablePartitioningPremium
=== RUN   TestAccAzureRMServiceBusTopic_enablePartitioningPremium
--- PASS: TestAccAzureRMServiceBusTopic_enablePartitioningPremium (504.31s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm    504.341s
```

sebastus/terraform-provider-azurerm,sebastus/terraform-provider-azurerm,sebastus/terraform-provider-azurerm