Add an option to check if there are deprecated models in Prompts.ahk

[Avastgard]

I've recently had to change several models inside Prompts.ahk because they no longer exist (e.g., google/gemini-2.0-flash-thinking). It would be nice to include an option to check all the models in the code to see if there is a response from the service.

Not sure if this is feasible or not, especially without having to spend credits.

[kdalanon]

This is a good idea, I'll add an option to check for valid models in future releases.