Don't persist LOCATION_GLOBAL_KILL_SWITCH

Bug: 68769804
Test: manual test
Test: atest ${ANDROID_BUILD_TOP}/frameworks/base/core/tests/coretests/src/android/provider/SettingsBackupTest.java
Test: atest ${ANDROID_BUILD_TOP}/frameworks/base/core/tests/coretests/src/android/provider/SettingsProviderTest.java
Test: atest SettingsProviderTest

Change-Id: I448e1aad10b517b41f58a15459c6dd1fbaf36478