Fix PlayerItemDamageEvent

This portion was removed in the 1.7.10 update, causing the event to never fire. Re-adding it fixes the event, and causes it to fire as usual.

Tested with a small logging plugin that confirmed after this change it was again firing, and still working as intended.

Relevant: http://www.spigotmc.org/threads/playeritemdamageevent-not-firing.24453/