Revise homepage sticky cards UI

- revmove material card layout
- remove slice header's divider
- add dividers below each sticky cards
- simplify contextual_slice_full_tile layout

Bug: 149371123
Test: visual
Change-Id: I13a8af21f565114220a093409e2a9ca664a57b02

src/com/android/settings/homepage/contextualcards/slices/SliceFullCardRendererHelper.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.homepage.contextualcards.slices;
 
+import static com.android.settings.homepage.contextualcards.slices.SliceContextualCardRenderer.VIEW_TYPE_STICKY;
+
 import android.app.settings.SettingsEnums;
 import android.content.Context;
 import android.view.View;
@@ -75,7 +77,9 @@ class SliceFullCardRendererHelper {
         // Customize slice view for Settings
         cardHolder.sliceView.setShowTitleItems(true);
         if (card.isLargeCard()) {
-            cardHolder.sliceView.setShowHeaderDivider(true);
+            if (holder.getItemViewType() != VIEW_TYPE_STICKY) {
+                cardHolder.sliceView.setShowHeaderDivider(true);
+            }
             cardHolder.sliceView.setShowActionDividers(true);
         }
     }