Fix replying and editing from chatbox
Restore the functionality to edit or reply to the last message in the chatbar.
This is achieved be moving the functions getLastLocalUserMessageEventId and getLatestMessageFromRow to NeoChatRoom as editLastMessage and replyLastMessage as chatbar no longer has access to messageEventModel.
The functions are also simplified as they only need to find the eventId and always from row 0 as this was the only use of the functions.