fix official weights

The model is no longer available from the link

app.py

@@ -25,8 +25,7 @@ device = 'cuda' if torch.cuda.is_available() else 'cpu'
 # Download official weights
 if not os.path.exists("saved_models"):
     os.mkdir("saved_models")
-    MODEL_PATH_URL = "https://drive.google.com/uc?id=1KyMpRjewZdyYfxHPYcd-ZbanIXtin0Sn"
-    gdown.download(MODEL_PATH_URL, "saved_models/isnet.pth", use_cookies=False)
+    os.system("mv isnet.pth saved_models/")
     
 class GOSNormalize(object):
     '''