Undo changes for our one year anniversary

Removes banner from study room & hat from hud.

I'll need to remove the banner from the tileset.

We need to decide what we want to do with the top box in the hud. I've currently got it set up to display the selected save slot (though it doesn't work - it always displays "SLOT 1"). Other options are removing the bar altogether, displaying character name or level name. You can just about fit 9 characters in the space, so whatever it it, it can't be long.