StayAwake Toggle : Avoid Loss of User Setting

Should disable the tendency to revert to 30
        second timeout if SystemUI dies
        while stayawake is enabled

PS2: Fix

Change-Id: I42e0edb96eeccce690481df1a0cd6e4767ac486e
Revert "A tiny optimalization"

This reverts commit b5fab2d0383d52f67f992c4ae8971b6da71819f6.
Revert "Don't let apps disable the SIM PIN entry screen."

This reverts commit 1a5f57566eeb0838623a61b720bdee95a71d884b.