WindowManager shouldn't layout non-visible windows

A recent change in WindowManager made background windows perform layout
(when they should really be left alone). This resulted in artifacts
where rotating the device and then going to a backgrojnd activity (launcher,
Recents) would briefly show that activity in the wrong size/orientation, then
flash to the correct one after a proper layout.

This fix is a simple workaround, leaving in the original fix that the code
change addressed (for keyguard orientation changes), while going back to the
previous (don't layout gone windows) for all other cases.

Issue #7428221 sometimes recents is drawn off-center and then fixes itself

Change-Id: I41b47933c2bd86f29133853d3387bb7294be8f48