AOD: Fix default for always-on setting

Change Ic35bd3c04d150fd3eb85d76db0043880b31a011f mistakenly
flipped the default to on. Change it back to off.

Test: runtest -x frameworks/base/packages/SystemUI/tests/src/com/android/systemui/doze/DozeConfigurationTest.java
Fixes: 36027947
Change-Id: If1619c10f8cc269f2dd852e166ac959e6c9c590a