Update app.py

Adding sys path fix

app.py

@@ -1,6 +1,8 @@
 import evaluate
 from evaluate.utils import launch_gradio_widget
 
-
+sys.path = [p for p in sys.path if p != "/home/user/app"]
 module = evaluate.load("sacrebleu")
+sys.path = ["/home/user/app"] + sys.path
+
 launch_gradio_widget(module)