undo app change

Author: awaelchli

examples/app_components/python/component_tracer.py

@@ -27,7 +27,7 @@ def on_train_start(self, trainer, pl_module) -> None:
                 print("Even the Lightning Work is available and state transfer works !")
                 print(self.lightning_work)
 
-            def on_train_batch_end(self, trainer, *_) -> None:
+            def on_batch_end(self, trainer, *_) -> None:
                 # On every batch end, collects some information.
                 # This is communicated automatically to the rest of the app,
                 # so you can track your training in real time in the Lightning App UI.