first map duplication

if map 0 is in the player's inventory in creative mode. when the player makes a second map (and any maps after that) it will make a semi fake copy of map 0. if the player throws one of the map zeros, then one of the maps will vanish but if the player separates the maps in an inventory then both maps will become permanent. in survival, the game tries to make a copy but it disappears almost instantly.