any typings using refs to components params

Hi,

Codegen in cool ^^, but i have some problem

I'm trying to use next yaml

```
openapi: 3.0.2

components:

schemas:
Employee:
type: object
required:
- id
properties:
id:
type: string
head:
type: object
required:
- id
properties:
id:
$ref: '#/components/schemas/Employee/id'

```
And after generating i have this model

```
export interface Employee {
id?: string;
head?: { id?: any };
}
```

But I think it should turn out like this:

```
export interface Employee {
id?: string;
head?: { id: string };
}
```