body type mismatch

[Raphael Smadja]

Describe the bug
In the _get_kwargs generated method, the body is determined as File type (because the format in my swagger definition is binary), but it tries to access its .to_dict attribute (because body_type is considered as data due to the content type application/x-www-form-urlencoded), which does not exist because it is a file

OpenAPI Spec File

"content": {
    "application/x-www-form-urlencoded": {
        "schema": {
            "description": "do stuff",
            "type": "string",
            "format": "binary"
        }
    }
}

Desktop (please complete the following information):

• OS: macOS 13.3.1
• Python Version: 3.9.8
• openapi-python-client version: 0.17.2

Additional context
In the macro, the arguments macro determine the argument type of body based on endpoint.bodies[0].prop.get_type_string(), whereas in the body_to_kwarg macro it determines it based on body.body_type, which is determined by the following:

        if simplified_content_type == "application/x-www-form-urlencoded":
            body_type = BodyType.DATA
        elif simplified_content_type == "multipart/form-data":
            body_type = BodyType.FILES
        elif simplified_content_type == "application/octet-stream":
            body_type = BodyType.CONTENT
        elif simplified_content_type == "application/json" or simplified_content_type.endswith("+json"):
            body_type = BodyType.JSON