Default saving embedding model to True

Author: MaartenGr

bertopic/_bertopic.py

@@ -3017,7 +3017,7 @@ def push_to_hf_hub(
             create_pr: bool = False,
             model_card: bool = True,
             serialization: str = "safetensors",
-            save_embedding_model: str = None,
+            save_embedding_model: Union[str, bool] = True,
             save_ctfidf: bool = False,
             ):
         """ Push your BERTopic model to a HuggingFace Hub