First autocomplete result for `virtualnetwork`

**Bicep version**
VSCode 0.12.40

**Describe the bug**
If you start typing `virtualNetwork` as a resource type, the top option is for something related to System Centre, when I'd expect it to be `Microsoft.Network/virtualNetworks`

**To Reproduce**
Type the following and look at the auto complete options
```bicep
resource vnet virtualnet
```

**Additional context**
Add any other context about the problem here.

Reproduce the autocomplete behavior in VSCode using `resource vnet virtualnet` and compare the listed resource types. Trace the autocomplete entry point that ranks resource-type suggestions; done means `Microsoft.Network/virtualNetworks` appears before the unrelated System Centre result.

Written by the indexing model from the issue text.