fix: dice.py

[gnzng]

Adding helper as an additional argument to solve the following issue in dice.py:

Traceback (most recent call last):
  File "/Users/damian/software/chatgpt-telegram-bot/bot/telegram_bot.py", line 697, in prompt
    async for content, tokens in stream_response:
  File "/Users/damian/software/chatgpt-telegram-bot/bot/openai_helper.py", line 184, in get_chat_response_stream
    response, plugins_used = await self.__handle_function_call(chat_id, response, stream=True)
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/damian/software/chatgpt-telegram-bot/bot/openai_helper.py", line 310, in __handle_function_call
    function_response = await self.plugin_manager.call_function(function_name, self, arguments)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/damian/software/chatgpt-telegram-bot/bot/plugin_manager.py", line 61, in call_function
    return json.dumps(await plugin.execute(function_name, helper, **json.loads(arguments)), default=str)
                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: DicePlugin.execute() takes 2 positional arguments but 3 were given