fix: Add message_payload to payload in create_thread_in_forum http method (#1101)

* Fix the thing

* ci: correct from checks.

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Nanrech

interactions/api/http/thread.py

@@ -221,7 +221,11 @@ async def create_thread_in_forum(
         """
         query = {"use_nested_fields": 1}
 
-        payload = {"name": name, "auto_archive_duration": auto_archive_duration}
+        payload = {
+            "name": name,
+            "auto_archive_duration": auto_archive_duration,
+            "message_payload": message_payload,
+        }
         if rate_limit_per_user:
             payload["rate_limit_per_user"] = rate_limit_per_user
         if applied_tags: