fix: fix bug in login functionality

utils/mes_player_activity_model.py

@@ -1,7 +1,7 @@
 from datetime import datetime
 
 class PlayerActivity():
-    def __init__() -> None:
+    def __init__(self) -> None:
         self.player_backend_user_id = None
         self.login_timestamp_tw = datetime.now()
         self.rendered_timestamp_tw = None