change favorite sync icon

Pixiview/Illust/FavoritesPage.xaml

@@ -9,7 +9,7 @@
                                 Title="{r:Text Favorites}">
     <ContentPage.ToolbarItems>
         <ToolbarItem Order="Primary" Clicked="Refresh_Clicked"
-                     IconImageSource="{DynamicResource FontIconRefresh}"/>
+                     IconImageSource="{DynamicResource FontIconCloudDownload}"/>
         <ToolbarItem Order="Primary" Clicked="ShareFavorites_Clicked"
                      IconImageSource="{DynamicResource FontIconShare}"/>
     </ContentPage.ToolbarItems>