Fix hardcoded temperature

[emerzon]

Description

Fixes hardcoded "0" temperature

How Has This Been Tested?

Checked correct temperature being sent to LLM

[vercel]

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[greptile-apps]

PR Summary

This PR replaces the hardcoded temperature value in the LLM completion call with a dynamic one pulled from the configuration, ensuring consistency with the LLMConfig settings.

• Updated temperature retrieval in backend/onyx/llm/chat_llm.py replacing the hardcoded “0”.
• Ensures temperature is dynamically set via the object's configuration, aligning with validated LLMConfig values.
• Provides runtime flexibility and maintains valid float range for model calls.

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