* Don't store stale screen/rotation modes in book's settings!
Gyro events *may* entirely bypass the local copy...
In any case, using a local copy was essentially asking for trouble...
Actually fix#5772
(because the issue was indeed that a Gyro swap from Portrait to Inverted
Portrait wasn't stored properly).
* Allow showing ScreenSavers in Inverted Portrait.
That works just fine, and won't lead to the confusing situation where a
lefty might pick up the device as a righty because the ScreenSaver
happens to be shown that way, only to have it rotate back to its lefty
orientation on wakeup...
f44b031702