Edit Pager Duty endpoint bug

[alexandreLamarre]

Bug description

The pager duty endpoint configuration options to do not show up in the UI when trying to edit the pager duty endpoint

Steps to reproduce

1. Create PG endpoint
2. Edit PG endpoint

Details

List API return value example

{
  "items": [
    {
      "endpoint": {
        "name": "Hosted Rancher Staging",
        "pagerDuty": {
          "integrationKey": "***"
        }
      },
      "id": {
        "id": "9356be68-4981-4740-9413-800659b8a5a4"
      }
    }
  ]
}

Get API return value example

```
{
  "name": "Hosted Rancher Staging",
  "pagerDuty": {
    "integrationKey": "***"
  }
}