Remove stringify from json property for `spo applicationcustomizer get`

[milanholemans]

When you look at the command spo applicationcustomizer get, in the result we have a property called Rights which is a JSON object.
Currently, we are stringifying this JSON object when it's returned from the API. There is no need to stringify this property, let's output it as a proper JSON property.

The output should look something like:

{
  "ClientSideComponentId": "7096cded-b83d-4eab-96f0-df477ed7c0bc",
  "ClientSideComponentProperties": "",
  "CommandUIExtension": null,
  "Description": null,
  "Group": null,
  "Id": "14125658-a9bc-4ddf-9c75-1b5767c9a337",
  "ImageUrl": null,
  "Location": "ClientSideExtension.ApplicationCustomizer",
  "Name": "Some customizer",
  "RegistrationId": null,
  "RegistrationType": 0,
  "Rights": {
    "High": 0,
    "Low": 0
  },
  "Scope": "Web",
  "ScriptBlock": null,
  "ScriptSrc": null,
  "Sequence": 0,
  "Title": "Some customizer",
  "Url": null,
  "VersionOfUserCustomAction": "16.0.1.0"
}