Fix logging exception in actor decorator

The exception information is added by default when calling
logger.exception and it is redundant to re-add it in the
message.

Signed-off-by: Daniel Zullo <[email protected]>

Author: daniel-zullo-frequenz

src/frequenz/sdk/actor/_decorator.py

@@ -207,10 +207,8 @@ async def _start_actor(self) -> None:
                 except asyncio.CancelledError:
                     logger.debug("Cancelling actor: %s", cls.__name__)
                     raise
-                except Exception as err:  # pylint: disable=broad-except
-                    logger.exception(
-                        "Actor (%s) crashed with error: %s", cls.__name__, err
-                    )
+                except Exception:  # pylint: disable=broad-except
+                    logger.exception("Actor (%s) crashed", cls.__name__)
                     if (
                         self.restart_limit is None
                         or number_of_restarts < self.restart_limit