Remove unused variable

roles/matrix-bot-maubot/defaults/main.yml

@@ -18,7 +18,6 @@ matrix_bot_maubot_proxy_management_interface: false
 matrix_bot_maubot_expose_management_interface: true
 
 
-matrix_bot_maubot_logging_level: info
 matrix_bot_maubot_secret: ''
 matrix_bot_maubot_admin_user: ''
 matrix_bot_maubot_admin_password: ''