Launcher2: Fix rotation bug

If you launche the application drawer, then press the
widgets tab, then rotate the device, the page index
is not saved correctly. The result is either a widget tab
highlighted and apps showing or vice versa. This should
fix that.

Change-Id: I83f966912d3479c36ac840052f8772fef1456cce
Signed-off-by: Stevespear426 <stephen.k.spear@gmail.com>