language_models: Fix passing of `thread_id` and `prompt_id` (#29071)

This PR is a follow-up to
https://github.com/zed-industries/zed/pull/29069 that fixes an issue
where the thread ID and prompt ID were not being sent up correctly.

Release Notes:

- N/A
9875521d4eMarshall Bowers committed on 4/18/2025, 9:12:23 PM· committed by GitHubparent8c55063
1 file changedLine totals unavailable