Added set/unset available offline action icons for tablets ignoring 'showAsAction=never' when action is the only one in the overflow menu

res/menu/file_actions_menu.xml

@@ -82,12 +82,14 @@
     <item
         android:id="@+id/action_favorite_file"
         android:title="@string/favorite"
-        app:showAsAction="never|"
+        app:showAsAction="never"
+        android:icon="@drawable/ic_action_set_available_offline"
         android:orderInCategory="1" />
     <item
         android:id="@+id/action_unfavorite_file"
         android:title="@string/unfavorite"
         app:showAsAction="never"
+        android:icon="@drawable/ic_action_unset_available_offline"
         android:orderInCategory="1" />
     <item
         android:id="@+id/action_see_details"