Change default value in Magnification always on setting to use config value as default value.

There was a bug b/302267236 raised the same issue and decision was made to disable the magnification always on setting for wear and overlay config was created for clockwork - https://source.corp.google.com/h/googleplex-android/platform/superproject/main/+/main:device/google/clockwork/overlay/frameworks/base/core/res/res/values/config.xml;l=1275. But this config was used as default for feature flag check ( so was always getting overriden by the remote feature flag) instead of settings check. So the proposed solution is to use this config for settings value check at . This config is false only for clockwork module.

Test: atest AccessibilityManagerServiceTest, manual
Bug: 370439112
Change-Id: Ic314c74bb7ac0aa2f3993051aefb30a5764be0cb