Fix use_angle_cls deprecation warning by using use_textline_orientation

app.py

@@ -17,7 +17,7 @@ This demo uses PaddleOCR instead, which works on CPU.
 @st.cache_resource
 def load_ocr():
     try:
-        ocr = PaddleOCR(use_angle_cls=True, lang='en', use_gpu=False)
+        ocr = PaddleOCR(use_textline_orientation=True, lang='en', use_gpu=False)
         return ocr
     except Exception as e:
         st.error(f"Error loading OCR: {e}")