The first beta version of iOS 4.2 released last month changed the behaviour of the orientation lock switch to act as a mute switch instead, similar to the function of the switch on the iPhone. When this change was first revealed, many wondered if this was intentional behaviour on Apple’s part or simply a temporary change as a result of unifying iOS 4.2 on both the iPhone and iPad devices. 9to5Mac is now reporting that this is an intentional…