Changed how Face Unlock coordinates are specified

Was using View.getLeft() and View.getTop() to specify the upper-left
corner of the Face Unlock area.  That gives coordinates relative the
view, which was fine for the phones.  For the tablet it needs
coordinates relative to the window (which still works for the phones).

Also fixed a 'bug' where h and w were swapped.  However, it wasn't
causing a problem because it was swapped in two places.

Change-Id: I86c1f68439f1dcef826cfe6b8fb56c9a4a6b8dc3