[Fix] Fix GPT-OSS example

[SumanthRH]

The config parameter reasoning_effort needs a + otherwise you'll see:

Could not override 'generator.chat_template_kwargs'.
To append to your config use +generator.chat_template_kwargs={reasoning_effort:low}
Key 'reasoning_effort' is not in struct
    full_key: generator.chat_template_kwargs.reasoning_effort
    object_type=dict

This was added by mistake in #390 while I was testing the script

[gemini-code-assist]

Code Review

I've reviewed the changes and have one suggestion to improve the robustness of the shell script. Overall, the fix seems correct.