Fix infinite durability.

For whatever reason, the Bukkit API thinks that 'Durability" and "Damage"
are synonymous.

src/main/java/com/sk89q/worldguard/bukkit/WorldGuardBlockListener.java

@@ -140,7 +140,7 @@ public void onBlockBreak(BlockBreakEvent event) {
             if (held.getTypeId() > 0
                     && !(ItemType.usesDamageValue(held.getTypeId())
                     || BlockType.usesData(held.getTypeId()))) {
-                held.setDurability(Material.getMaterial(held.getTypeId()).getMaxDurability());
+                held.setDurability((short) 0);
                 player.setItemInHand(held);
             }
         }