Fix battery saver setting default state

- Battery saver is off by default.

Test: manual test with: settings delete global low_power && settings delete global low_power_trigger_level
Test: b ROBOTEST_FILTER=BatterySaver RunSettingsRoboTests

Bug: 76460719
Change-Id: I749bba9a5e36fe8ccee6e4ed843596bc94d96fcc
Fix: 76460719

tests/robotests/src/com/android/settings/fuelgauge/batterysaver/AutoBatterySaverPreferenceControllerTest.java

@@ -45,8 +45,6 @@ public class AutoBatterySaverPreferenceControllerTest {
     public void setUp() {
         MockitoAnnotations.initMocks(this);
 
-        SettingsShadowResources.overrideResource(
-                com.android.internal.R.integer.config_lowBatteryWarningLevel, 15);
         mContext = RuntimeEnvironment.application;
         mPreference = new SwitchPreference(mContext);
         mController = new AutoBatterySaverPreferenceController(mContext);
@@ -87,7 +85,7 @@ public class AutoBatterySaverPreferenceControllerTest {
     }
 
     @Test
-    public void testIsChecked_useDefaultValue_returnTrue() {
-        assertThat(mController.isChecked()).isTrue();
+    public void testIsChecked_useDefaultValue_returnFalse() {
+        assertThat(mController.isChecked()).isFalse();
     }
 }

tests/robotests/src/com/android/settings/fuelgauge/batterysaver/AutoBatterySeekBarPreferenceControllerTest.java

@@ -71,11 +71,10 @@ public class AutoBatterySeekBarPreferenceControllerTest {
     }
 
     @Test
-    public void testPreference_defaultValue_preferenceVisible() {
+    public void testPreference_defaultValue_preferenceNotVisible() {
         mController.updateState(mPreference);
 
-        assertThat(mPreference.isVisible()).isTrue();
-        assertThat(mPreference.getProgress()).isEqualTo(DEFAULT_LEVEL);
+        assertThat(mPreference.isVisible()).isFalse();
     }
 
     @Test