Fix non-stacking renamed items. Fixes BUKKIT-4809

In the recent Minecraft update mojang rendered the fix in e20e50f,
which fixed the inconsistencies in saved/non-saved nbt data, to be
obsolete and the complete opposite of how CraftBukkit treated NBT
data.

By forcing the name to be set no matter what the situation, we "fix
discrepancies in NBT" once again.