Update height of SliceView

So it can display 6 items at most, not 4 items

Bug: 120803703
Test: Manual
Change-Id: Id34398903d0f81bebee3e02c024d21ad2e68578f

src/com/android/settings/slices/SlicePreference.java

@@ -44,6 +44,7 @@ public class SlicePreference extends LayoutPreference {
     private void init() {
         mSliceView = findViewById(R.id.slice_view);
         mSliceView.showTitleItems(true);
+        mSliceView.setScrollable(false);
     }
 
     public void onSliceUpdated(Slice slice) {