security: fix FC for security option

If device is a low-memory one then the key_enable_widget dependency can't be removed.
So, move the logic to disable maximize widget feature for low-memory devices.

PS2: This should work now. Crondog
PS3: Fixed PS2 comments

Signed-off-by: Humberto Borba <humberos@gmail.com>
Change-Id: I2b6aa44e26f6fb9371da7ef61d9e85a13643ba30
Merge "security: fix FC for security option" into android-4.4
Merge branch 'android-4.4' of https://github.com/omnirom/android_packages_apps_Settings into android-4.4