Support for coloured leather armour.

If a Leather piece of armour has been dyed another colour, it will now return the colour of the leather item on the string, e.g. 'Purple Leather Chestplate'.
That data value is just for the jukebox block - it won't apply to the jukebox item, which is all we're interested in here.  Since any record is popped out when the jukebox is broken, the jukebox item can't be holding a record.