Fix revised_prompt parameter name so it will be correctly deserialized. #197
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The OpenAI image generation endpoint returns a field called revised_prompt. When you submit a prompt for image generation, before sending it to Dalle3, GPT revises it. This field contains the actual text that Dalle3 used.
As of now, this C# API does not correctly deserialize this field because there is no JsonProperty to match the names in the Response model.
This pull request is a one-line fix. I've tested it and it works locally.