fix: thread report request

[tomovicj]

Checklist:

• I have read freeCodeCamp's contribution guidelines.
• My pull request has a descriptive title (not a vague title like Update index.md)

Tests expects you to use "thread_id" when reporting a thread with PUT request, but the project's frontend is using "report_id" for the request. Link to tests

[gikf]

Description and test is rather clear about using thread_id. Demo project appear to use report_id - https://anonymous-message-board.freecodecamp.rocks/ https://github.com/freeCodeCamp/demo-projects/tree/main/apps/anonymous-message-board. It'd be good to change that one as well.