Remove message.content from openai streaming API
diff --git a/extensions/openai/completions.py b/extensions/openai/completions.py
index c6deefb3d2..897d542ce5 100644
--- a/extensions/openai/completions.py
+++ b/extensions/openai/completions.py
@@ -297,8 +297,6 @@ def chat_streaming_chunk(content):
             resp_list: [{
                 "index": 0,
                 "finish_reason": None,
-                # So yeah... do both methods? delta and messages.
-                "message": {'role': 'assistant', 'content': content},
                 "delta": {'role': 'assistant', 'content': content},
             }],
         }

The [OpenAI spec](https://platform.openai.com/docs/api-reference/streaming) does not expect a `message` object when streaming is enabled. Returning both sometimes [causes issues in downstream consumers](https://github.com/danny-avila/LibreChat/discussions/1795).

## Checklist:

- [x] I have read the [Contributing guidelines](https://github.com/oobabooga/text-generation-webui/wiki/Contributing-guidelines).
