Code Quality: Use filled icon for updates

Author: yaira2

src/Files.App/UserControls/AddressToolbar.xaml

@@ -590,6 +590,7 @@
 							Width="16"
 							Height="16"
 							x:Load="{x:Bind ViewModel.IsUpdating, Mode=OneWay, Converter={StaticResource BoolNegationConverter}}"
+							IsFilled="True"
 							Style="{StaticResource App.ThemedIcons.AppUpdateAvailable}" />
 
 						<!--  Progress  -->