Make ModuleDefaultVersion ListHandler conform to contract tests

[MalikAtalla-AWS]

The contract tests expect that the ListHandler returns the default module versions, not the module itself.

Currently, when we invoke the ListHandler we get the Module arns like this:

aws cloudcontrol list-resources --type-name AWS::CloudFormation::ModuleDefaultVersion --region us-west-2

{
    "ResourceDescriptions": [
        {
            "Identifier": "arn:aws:cloudformation:us-west-2:123:type/module/Malik-mm-mm-MODULE",
            "Properties": "{\"ModuleName\":\"Malik::mm::mm::MODULE\",\"Arn\":\"arn:aws:cloudformation:us-west-2:123:type/module/Malik-mm-mm-MODULE\"}"
        }
    ],
    "TypeName": "AWS::CloudFormation::ModuleDefaultVersion"
}

But, the expected output according to the resource contract is like this:

{
    "ResourceDescriptions": [
        {
            "Identifier": "arn:aws:cloudformation:us-west-2:123:type/module/Malik-mm-mm-MODULE/00000001",
            "Properties": "{\"ModuleName\":\"Malik::mm::mm::MODULE\",\"Arn\":\"arn:aws:cloudformation:us-west-2:123:type/module/Malik-mm-mm-MODULE\"}"
        }
    ],
    "TypeName": "AWS::CloudFormation::ModuleDefaultVersion"
}

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.