Fixed Golden Door Item ID Mishandling

Keybounce noticed that he was having a persistent item ID conflict with
DD's Golden Doors - the normal doors not the dimensional variant. I
discovered that we have been assigning them the same ID as the Golden
Door block ever since they were first introduced 7 months ago. It didn't
break immediately since Forge adds +256 to item IDs.
Merge pull request #156 from SenseiKiwi/master

Fixed Golden Door Item ID Mishandling