fix: preferred_loaders is always None in data_item_to_text_file.load_file() (#1554)

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## Description
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*LoaderEngine.py*
```python
async def load_file(
        self,
        file_path: str,
        file_stream: Optional[Any],
        preferred_loaders: Optional[List[str]] = None,
        **kwargs,
    ):
        ...
        print(file_path, file_stream, preferred_loaders, kwargs)
        ...
```

shows
`https://cognee.ai ['web_url_loader'] None {}`

i.e. preferred_loaders is always None when `self.get_loader(file_path,
preferred_loaders)`

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cognee/infrastructure/loaders/LoaderEngine.py

@@ -105,7 +105,6 @@ class LoaderEngine:
     async def load_file(
         self,
         file_path: str,
-        file_stream: Optional[Any],
         preferred_loaders: Optional[List[str]] = None,
         **kwargs,
     ):