[BugFix] API: Reverse Output Of Wrapper Checking Object To Pass Custom Response Model

[deeleeramone]

1. Why?:

   • This PR corrects the API command wrapper for the desired behavior.
     • no_validate=True in the @command decorator is for discarding all output response models entirely.
       • Setting as True will defeat the automatic generation of columnsDefs by openbb-platform-api
     • The default, False, retains the response models and allows any type to be defined - i.e, -> dict or -> SomeModel or -> OBBject.

2. What?:

   • Basically just reverses what the check was to look for instance of OBBject before acting.

3. Impact:

   • Most notably impacted are the data processing routers.

4. Testing Done:

@router.command(methods=["GET"])
async def some_metric(
    symbol: str,
) -> dict:
    """Some metric for a stock."""
    return {
        "label": "P/E",
        "value": 600,
        "delta": "",
    }