BETA: Minor typo fix in ItemsOnGroundManager from [5644].

Reported by: valdaron

L2J_Server_BETA/java/com/l2jserver/gameserver/instancemanager/ItemsOnGroundManager.java

@@ -181,7 +181,7 @@ public class ItemsOnGroundManager implements Runnable
 		try (Connection con = L2DatabaseFactory.getInstance().getConnection();
 			Statement s = con.createStatement())
 		{
-			s.executeQuery("DELETE FROM itemsonground");
+			s.executeUpdate("DELETE FROM itemsonground");
 		}
 		catch (Exception e1)
 		{