fix: delete thread throwing error

[taimoor-ahmed-1]

This PR fixes delete thread api throwing an error when the thread id wasn't being fetched from the users' read states.

Each read state has course_id field and contains thread_ids for only that course. The issue with current code was that it was trying to delete thread_id from all read_states of the user which is not possible because a thread_id can exist in only one course/read_state of a user.

close #147

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Thanks for the pull request, @taimoor-ahmed-1!

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[Faraz32123]

changes LGTM!

Did we identified the edge case why thread_id is not present in User's read_states although it should exists?

[taimoor-ahmed-1]

changes LGTM!

Did we identified the edge case why thread_id is not present in User's read_states although it should exists?

Yes, each read state has course_id field and contains thread_ids for only that course. The issue with current code was that it was trying to delete thread_id from all read_states of the user which is not possible because a thread_id can exist in only one course/read_state.

[Ali-Salman29]

LGTM!