Refactor flags of Power Anomaly Tips in Settings Intelligence.(1/2)

- Remove unused flag is_battery_tips_feedback_enabled
- Update logic about is_battery_tips_enabled

Bug: 284893240
Test: Manual
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:24e269dd0a63b5cb98fec791708cfe294b5aa47c)
Change-Id: I826f517aa61e0c970048164706c4512ac3e0472d

tests/robotests/src/com/android/settings/fuelgauge/PowerUsageFeatureProviderImplTest.java

@@ -72,10 +72,6 @@ public class PowerUsageFeatureProviderImplTest {
         assertThat(mPowerFeatureProvider.isBatteryTipsEnabled()).isFalse();
     }
 
-    @Test
-    public void testIsBatteryTipsFeedbackEnabled_returnFalse() {
-        assertThat(mPowerFeatureProvider.isBatteryTipsFeedbackEnabled()).isFalse();
-    }
     @Test
     public void testGetBatteryUsageListConsumePowerThreshold_return0() {
         assertThat(mPowerFeatureProvider.getBatteryUsageListConsumePowerThreshold()).isEqualTo(0.0);