Update app.py

app.py

@@ -56,8 +56,8 @@ def get_dlib_face_detector(predictor_path: str = "shape_predictor_68_face_landma
 
     if not os.path.isfile(predictor_path):
         model_file = "shape_predictor_68_face_landmarks.dat.bz2"
-        os.system(f"wget http://dlib.net/files/{model_file}")
-        os.system(f"bzip2 -dk {model_file}")
+        os.system("wget http://dlib.net/files/shape_predictor_68_face_landmarks.dat.bz2")
+        os.system("bzip2 -dk shape_predictor_68_face_landmarks.dat.bz2")
 
     detector = dlib.get_frontal_face_detector()
     shape_predictor = dlib.shape_predictor(predictor_path)