Stop showing battery card in homepage

In previous design, we add default card feature for "me Card". But "me
Card" is being built by another team. We have removed related cards from
default card feature in ag/5394464 but battery card. Now, remove it.

Fixes: 119819851
Test: robotests
Change-Id: I445546024c80c227abce649008ec648340577e99

tests/robotests/src/com/android/settings/homepage/contextualcards/ContextualCardLoaderTest.java

@@ -40,7 +40,6 @@ import org.robolectric.RuntimeEnvironment;
 import org.robolectric.shadows.ShadowContentResolver;
 
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 
@@ -60,17 +59,6 @@ public class ContextualCardLoaderTest {
                 mProvider);
     }
 
-    @Test
-    public void createStaticCards_shouldContainCorrectCards() {
-        final Uri batteryInfo = BatterySlice.BATTERY_CARD_URI;
-        final List<Uri> expectedUris = Arrays.asList(batteryInfo);
-
-        final List<Uri> actualCardUris = mContextualCardLoader.createStaticCards().stream().map(
-                ContextualCard::getSliceUri).collect(Collectors.toList());
-
-        assertThat(actualCardUris).containsExactlyElementsIn(expectedUris);
-    }
-
     @Test
     public void isCardEligibleToDisplay_customCard_returnTrue() {
         final ContextualCard customCard = new ContextualCard.Builder()
@@ -224,4 +212,4 @@ public class ContextualCardLoaderTest {
                 .build());
         return cards;
     }
-}
+}