openAI custom model not work expected

[iptton]

Describe the bug
openAI custom model not work as expected

To Reproduce
Steps to reproduce the behavior:

1. set custom openai model
2. chat in chat panel
3. reopen setting panel, the openAI model will reset from custom to gpt-3.5-turbo

Expected behavior
setting stay "custom"

relate code:

        get() {
            val customModel = AutoDevSettingsState.getInstance().customModel
            if(AutoDevSettingsState.getInstance().openAiModel == SELECT_CUSTOM_MODEL) {
                AutoDevSettingsState.getInstance().openAiModel = customModel
            }
            return  AutoDevSettingsState.getInstance().openAiModel
        }

will reset openAIModel to a unknow value

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