[LockSettings] migrate patterns to be indexed at '1'

Base zero patterns (ones where the top left is idx 0)
are not handled properly by scrypt. Add logic to re-enroll
base zero patterns such that the top left is idx 1.

Bug: 21433955
Change-Id: I7f67f2c67d40dd1be6c62117710dc3b0392275a2
3 files changed