The Daley Center’s sixth floor shut down for less than an hour today as authorities investigated a suspicious package around 11:40 a.m.Daley Center building security said the package, which read, “World leaders, important” on the front, was propped against a sixth-floor bathroom trash can.Security officials said court patrons were not prohibited from entering or exiting the building, but they could not access the sixth floor while a bomb squad investigated the package.It was eventually determined that the …