Use CardView instead of card 9 png drawable

app/src/main/java/com/hippo/ehviewer/widget/SearchBar.java

@@ -111,8 +111,6 @@ public class SearchBar extends FrameLayout implements View.OnClickListener,
     }
 
     private void init(Context context) {
-        setBackgroundResource(R.drawable.card_white_no_padding_2dp);
-
         mSearchDatabase = SearchDatabase.getInstance(getContext());
 
         LayoutInflater inflater = LayoutInflater.from(context);