fixup! Revert "feat(knocking): use handle_stripped_state_event to c…

…heck the membership state event"

crates/matrix-sdk-base/src/sliding_sync/mod.rs

@@ -1119,7 +1119,7 @@ mod tests {
 
         // When the room is set as knocked with a random user id as state key,
         let mut room = http::response::Room::new();
-        set_room_knocked(&mut room, &user_id);
+        set_room_knocked(&mut room, user_id);
 
         let response = response_with_room(room_id, room);
         client.process_sliding_sync(&response, &(), true).await.expect("Failed to process sync");