Remove unused import

src/main/java/com/gmail/nossr50/listeners/InventoryListener.java

@@ -14,7 +14,6 @@ import org.bukkit.event.inventory.InventoryClickEvent;
 import org.bukkit.event.inventory.InventoryCloseEvent;
 import org.bukkit.event.inventory.InventoryOpenEvent;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.metadata.FixedMetadataValue;
 
 import com.gmail.nossr50.mcMMO;
 import com.gmail.nossr50.datatypes.skills.SecondaryAbility;