chore: remove parallel_tool_calls when no tools specified

[nitpicker55555]

Remove parallel_tool_calls from request config when tools are not present, as OpenAI API only allows this parameter when tools are specified.

Files modified:

• camel/models/openai_model.py
• camel/models/azure_openai_model.py
• camel/models/openai_compatible_model.py

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[Wendong-Fan]

thanks @nitpicker55555 !