Fix options being passed to the ollama chat api

[alappe]

I noticed that https://github.com/ollama/ollama/blob/main/docs/api.md#generate-a-chat-completion and https://github.com/ollama/ollama/blob/main/docs/modelfile.md#valid-parameters-and-values document that those options all need to be passed to the options: {} sub structure.

My local instance testing with llama v3.1 and ollama v0.3.10 complains because num_gqa is unknown. I left it in there for now because other models might need it.