Check for update before return the description for the openai-gpt agent

[daxian-dbw]

PR Summary

Fix #327

Check for update before return the description, so that /refresh command can get the up-to-date description from the openai-gpt agent.

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shell/agents/AIShell.OpenAI.Agent/Agent.cs:28

• [nitpick] The private variable '_description' should be named consistently with the existing private variables, such as '_description'. Consider renaming it to '_description'.

private string _description;