baidu-qianfan[patch]: Fix the issue of missing request parameters

[Versirity]

This PR is to fix the issue where only the messages parameter was sent: The generated request:
{ stream: false, user_id: undefined, temperature: undefined, top_p: undefined, penalty_score: undefined, system: 'Translate the following from English into Chinese!', messages: [ { role: 'user', content: 'hello?' } ] }
is correct, but when sending the request, only the messages parameter was included, and the other parameters were not sent.

{
  stream: false,
  user_id: undefined,
  temperature: undefined,
  top_p: undefined,
  penalty_score: undefined,
  system: 'Translate the following into italian:',
  messages: [ { role: 'user', content: 'hi!' } ]
}
####error return（system parameters were not sent)
{
  words: 'Hello there! I am doing well and feeling quite alright. I am a virtual artificial intelligence language model and I am always here to assist you. What about you? How are you today?'   
}
####correct return
{ words: 'Ciao!' }

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[bracesproul]

lgtm, thank you!