Login fails when auth.loginEndpoint is set in yml: token not found at path "token"

When auth.loginEndpoint is set in the yml config, the login request returns the following response:

```json
{
  "error": "token not found at path \"token\""
}
```

Because of this, the login flow cannot be completed.

This is my configuration in adminyo.yml:
```yml
auth:
  loginEndpoint: "path"
```