Made popupContainer's shadow & arrow visible in secondary display am: 924852fec5

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/19789527

Change-Id: Ie186f7728435b7e27a2015f931c726db2a1eddfe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

res/layout/secondary_launcher.xml

@@ -18,6 +18,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:id="@+id/drag_layer"
+    android:clipChildren="false"
     android:padding="@dimen/dynamic_grid_edge_margin">
 
     <GridView
@@ -52,7 +53,6 @@
         android:saveEnabled="false"
         android:layout_gravity="bottom|end"
         android:background="@drawable/round_rect_primary"
-        android:elevation="2dp"
         android:visibility="invisible" >
 
         <include