Title generation isn't included in calculated costs

[Xtrah]

Title generation isn't included in calculated costs (or it might be incorrectly calculated).

Tested in #329 when using Azure endpoint with GPT-4, considering that title generation uses gpt-3.5-turbo, it should incur a small charge on the gpt-3.5-turbo estimation when generating a thread title, but it currently doesn't.

[ztjhz]

The total token costs are updated here: https://github.com/ztjhz/BetterChatGPT/blob/main/src/hooks/useSubmit.ts#L186

[Xtrah]

Considering the title generation uses gpt-3.5-turbo, shouldn't there be a gpt-3.5-turbo charge calculated here then, or does it add onto the estimated gpt-4 cost?

[ztjhz]

This is a bug, currently it adds the cost to the current model chosen.