Fix interaction of magnification and Final-crop.

In the case of magnification we simulate a transformation to screen space
by transforming all windows with the MagnificationSpec values. This means
we need to transform other values which are in "real screen-space" as well,
like final crop.

Bug: 36129852
Bug: 38322835
Test: Manual
Change-Id: I3215ffb75ba66a29135a79bcb23da51c828739fc