fix: Invalid read param in forum thread api

This PR fixes the invalid read parameter being passed in forum update_thread api.
this was somehow introduced in this commit 6f522f3992 (diff-b9d08209a02c673887f6ca72b0018758174e95508539adbcb6885f22c7844eb8L292)

lms/djangoapps/discussion/rest_api/tests/test_views_v2.py

@@ -215,7 +215,6 @@ class ThreadViewSetPartialUpdateTest(
             "anonymous_to_peers": False,
             "closed": False,
             "pinned": False,
-            "read": True,
             "editing_user_id": str(self.user.id),
         }
         self.check_mock_called_with("update_thread", -1, **params)

openedx/core/djangoapps/django_comment_common/comment_client/models.py

@@ -287,7 +287,6 @@ class Model:
             "close_reason_code": request_params.get("close_reason_code"),
             "closing_user_id": request_params.get("closing_user_id"),
             "endorsed": request_params.get("endorsed"),
-            "read": request_params.get("read"),
         }
         request_data = {k: v for k, v in request_data.items() if v is not None}
         response = forum_api.update_thread(**request_data)