Remove BatteryFixSlice as it's not used

The BatteryFixSlice hasn't been used for a while, and it's introducing
memory leaks due to a design change at the framework's end. Hence,
remove it.

Bug: 245385410
Test: robotests
Change-Id: I517cab71a32613d5cb5fcd3beb991a24926a2902
Merged-In: I517cab71a32613d5cb5fcd3beb991a24926a2902
(cherry picked from commit e3fcf1f082)

src/com/android/settings/fuelgauge/BatteryBroadcastReceiver.java

@@ -28,7 +28,6 @@ import androidx.annotation.IntDef;
 import androidx.annotation.VisibleForTesting;
 
 import com.android.settings.Utils;
-import com.android.settings.homepage.contextualcards.slices.BatteryFixSlice;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
@@ -135,6 +134,5 @@ public class BatteryBroadcastReceiver extends BroadcastReceiver {
                 mBatteryListener.onBatteryChanged(BatteryUpdateType.BATTERY_SAVER);
             }
         }
-        BatteryFixSlice.updateBatteryTipAvailabilityCache(mContext);
     }
 }