update refresh chatbot

chatbot.py

@@ -58,7 +58,9 @@ def update_gallery_images():
 
 def upload_image_callback():
     st.session_state.uploaded_image = st.session_state.uploader
-
+    st.session_state.question = []
+    st.session_state.answer = []
+    st.session_state.input = ''
 
 def show():
     init_chat_history()