Keep defaults for /chat/completions parameters

Ref:
- https://platform.openai.com/docs/api-reference/completions/create#completions-create-temperature

Author: johnd0e

openai/init.moon

@@ -265,7 +265,7 @@ class OpenAI
 
     payload = {
       model: "gpt-3.5-turbo"
-      temperature: 0.5
+      -- temperature: 1
       :messages
     }