Remove line still causing the error reported in #180

Author: insolor

async_tkinter_loop/async_tkinter_loop.py

@@ -106,8 +106,6 @@ async def some_async_function():
     button = tk.Button("Press me", command=some_async_function)
     ```
     """
-    event_loop = event_loop or get_event_loop()
-
     @wraps(async_function)
     def wrapper(*handler_args) -> None:
         loop = event_loop or get_event_loop()