clean up state

app.py

@@ -130,10 +130,6 @@ with gr.Blocks() as demo:
     # We make a new recording id, and store it in a Gradio's session state.
     recording_id = gr.State(uuid.uuid4())
 
-    # Also store the current timeline and time of the viewer in the session state.
-    current_timeline = gr.State("")
-    current_time = gr.State(0.0)
-
     # When registering the event listeners, we pass the `recording_id` in as input in order to create
     # a recording stream using that id.
     detect_objects.click(