fixed bge_model_name_notfound

hf threw an error when loading HFBGEEmbeddings

app_final.py

@@ -92,7 +92,7 @@ model_kwargs = {"device": "cpu"}
 encode_kwargs = {"normalize_embeddings": True}
 if "embeddings" not in st.session_state:
     st.session_state.embeddings = HuggingFaceBgeEmbeddings(
-        # model_name=model_name, 
+        model_name=model_name, 
         model_kwargs = model_kwargs,
         encode_kwargs = encode_kwargs)
 embeddings = st.session_state.embeddings