Fix missed diff in FoodMetaData. Fixes BUKKIT-4704

**The Issue:**


IN 1.6.2, when Players are healed from having the appropriate hunger amount, they are supposed to take 3 exhaustion, as detailed in
https://github.com/Bukkit/mc-dev/blob/master/net/minecraft/server/FoodMetaData.java#L39

However, it seems this diff was missed in the CraftBukkit update, resulting in that penalty not being issued on healing, deviating from vanilla behavior.

**PR Breakdown:**
This fixes the missing diff and restores vanilla behavior.

**Ticket:**
https://bukkit.atlassian.net/browse/BUKKIT-4704