removed logging file handler

roles/matrix-maubot/templates/maubot_config.yaml.j2

@@ -86,12 +86,6 @@ logging:
         precise:
             format: "[%(asctime)s] [%(levelname)s@%(name)s] %(message)s"
     handlers:
-        file:
-            class: logging.handlers.RotatingFileHandler
-            formatter: precise
-            filename: /var/log/maubot.log
-            maxBytes: 10485760
-            backupCount: 10
         console:
             class: logging.StreamHandler
             formatter: precise
@@ -104,4 +98,4 @@ logging:
             level: INFO
     root:
         level: DEBUG
-        handlers: [file, console]
+        handlers: [console]