In the windows test, the group number was not propagated to main.ps1.
In the windows test, the group number was not propagated to main.ps1.

Fixed it.

Change-Id: I257b87aa60b48adfdf6572d0869c66a40c46a44e

GoogleCloudPlatform/dotnet-docs-samples,GoogleCloudPlatform/dotnet-docs-samples,GoogleCloudPlatform/dotnet-docs-samples,GoogleCloudPlatform/dotnet-docs-samples