Disable logging for Tox buffers

As per the Tox Client Standard.
<https://github.com/Tox/Tox-Client-Standard>

src/twc-chat.c

@@ -89,6 +89,11 @@ twc_chat_new(struct t_twc_profile *profile, const char *name)
         return NULL;
     }
 
+    /* disable logging for buffer */
+    weechat_hook_signal_send("logger_stop",
+                             WEECHAT_HOOK_SIGNAL_POINTER,
+                             chat->buffer);
+
     twc_chat_queue_refresh(chat);
     twc_list_item_new_data_add(profile->chats, chat);