Message edit is shown as regular event in the room list preview

When a message is edited, the edit is correctly applied to the original event in the room timeline. However, when viewing the room preview in the room list, the edit is instead treated as a separate event, with the fallback text being displayed in the room preview.

Steps to reproduce:
While looking at a room in the room list in RiotX: From another client (on a different device), send one message, then send a second message, and then edit the first message. The edit's fallback text will show up as the room's preview message in RiotX, even though it should be ignored and the second message should be the preview message.