Enable lockscreen blur for see through by default

But keep the blur radius user configurable
Fix: Ensure lockscreen see through setting persists after reboot

If see through was enabled and the device was rebooted,
the user had to toggle the setting off and on again to activate.

Change-Id: Ic743986d9b0abae138e2291864ce527c4f9ff864

Conflicts:
	src/com/android/settings/SecuritySettings.java