Update app.py

Removed old comment reference to setting OS environment variable for OpenAI key

app.py

@@ -26,7 +26,6 @@ def chatbot(input, history=[]):
 
 # function to set OpenAI key and initalize LangChain chain
 def set_open_ai_key(input):
-    # os.environ["OPENAI_API_KEY"] = input
 
     # read in embedddings from vector db store
     embeddings = OpenAIEmbeddings(openai_api_key=input)