Update app.py

app.py

@@ -67,7 +67,7 @@ def server(input: Inputs, output: Outputs, session: Session):
         combined_file = tempfile.NamedTemporaryFile(delete=False, suffix='.png')
         original_file = tempfile.NamedTemporaryFile(delete=False, suffix='.png')
         image.save(original_file.name, "PNG", quality=100)
-        combined.save(combined_file.name, "PNG", quality=100)
+        mask.save(combined_file.name, "PNG", quality=100)
         
         return original_file.name, combined_file.name