Update app.py

app.py

@@ -1,7 +1,7 @@
 import cv2
 import streamlit as st
 import numpy as np
-from app import VideoFrameHandler
+from drowsiness_detection import VideoFrameHandler
 from streamlit_webrtc import webrtc_streamer, VideoProcessorBase, WebRtcMode
 
 # Streamlit app UI