refactor: update player activity model timestamps

utils/mes_player_activity_model.py

@@ -3,18 +3,18 @@ from datetime import datetime
 class PlayerActivity():
     def __init__(self) -> None:
         self.player_backend_user_id = None
-        self.login_timestamp_tw = datetime.now()
-        self.rendered_timestamp_tw = None
+        self.login_timestamp = datetime.now()
+        self.rendered_timestamp = None
 
     def render_finished(self, player_info):
         self.player_backend_user_id = player_info['player_backend_user_id']
-        self.rendered_timestamp_tw = datetime.now()
+        self.rendered_timestamp = datetime.now()
 
     def to_dict(self):
         return {
             'player_backend_user_id': self.player_backend_user_id,
-            'login_timestamp_tw': self.login_timestamp_tw,
-            'rendered_timestamp_tw': self.rendered_timestamp_tw
+            'login_timestamp': self.login_timestamp,
+            'rendered_timestamp': self.rendered_timestamp
         }