fix(bug): Fix ollama configuration

[kanya989612]

tested by this config:

 kota.setup({
  model = "ollama-qwen2.5-coder:1.5b",
  api_key = os.getenv("API_KEY"),
  api_base = "http://127.0.0.1:11434",
  temperature = 0.7,
  ...
})