Give display surfaces and ottomans their own icons in the "Objects by Room" menu

Currently there are two major object types in Build Mode that do not have their respective icons in the "Objects by Room" menu. Those are display surfaces and ottomans.

It would be nice if they could have them, since scrolling through the list in the "Objects by Type" menu can be a bit of a hassle, especially if one is used to building mainly through the room menu. Them missing from the room menu also allows for these types of items to be easily missed by builders.