Adjust ref class name to camel case

[AllyW]

tsp model:

  @doc("Error when job fails in it's entirety.")
  @visibility(Lifecycle.Read)
  error?: Azure.Core.Foundations.Error;

output:

{
    "type": "object",
    "cls": "AzureCoreFoundationsError_read",
    "props": [
    ......
    ],
    "name": "error",
    "description": "Error when job fails in it's entirety.",
    "readOnly": true
}