Email: Fix exit after rotate in account setup UI

After rotate the screen and click next button in account setup
UI, a wrong result code will returns to MailActivity, MailActivity
finishs itself then.
So save the state of the account setup UI and restore it after
rotate the screen to make sure the return result is right.

Change-Id: I6c1cced8ade340a6ade5e0b3348314ba7bc933ac
CRs-Fixed: 2215776
Issue: FP2P-518
(cherry picked from commit ce3d3d64a50838fa3636ae5a7dc731eaf25ac62e)
1 file changed