Remove the shadow on the toolbar in PhotoPicker

Test: manual
Bug: 195123296
Change-Id: Id6ca8f349e4828445384eb46e5be61d41d738775
Merged-In: Id6ca8f349e4828445384eb46e5be61d41d738775
(cherry picked from commit 588e0831999b448df758bb157fbc5923be0873ae)
diff --git a/res/layout/activity_photo_picker.xml b/res/layout/activity_photo_picker.xml
index ce9b7d0..7debf56 100644
--- a/res/layout/activity_photo_picker.xml
+++ b/res/layout/activity_photo_picker.xml
@@ -38,7 +38,8 @@
 
         <com.google.android.material.appbar.AppBarLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content">
+            android:layout_height="wrap_content"
+            app:liftOnScroll="true">
 
             <androidx.appcompat.widget.Toolbar
                 android:id="@+id/toolbar"