Drop rikkax's recyclerview fix

* Now that we are Android S and above, we don't need these fix anymore

app/src/main/java/com/hippo/widget/ContentLayout.java

@@ -56,8 +56,6 @@ import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 
-import rikka.recyclerview.RecyclerViewKt;
-
 public class ContentLayout extends FrameLayout {
 
     private CircularProgressIndicator mProgressView;
@@ -124,9 +122,6 @@ public class ContentLayout extends FrameLayout {
                 resources.getColor(R.color.loading_indicator_orange));
         mBottomProgress.setIndeterminateAnimationType(LinearProgressIndicator.INDETERMINATE_ANIMATION_TYPE_CONTIGUOUS);
 
-        RecyclerViewKt.addEdgeSpacing(mRecyclerView, 4, 4, 4, 4, TypedValue.COMPLEX_UNIT_DIP);
-        RecyclerViewKt.fixEdgeEffect(mRecyclerView, false, true);
-
         mRecyclerViewOriginBottom = mRecyclerView.getPaddingBottom();
         mFastScrollerOriginBottom = mFastScroller.getPaddingBottom();
     }