Fix properties navigation background (#1990)

* Override NavigationView background

* Remove spaces

* Use NavigationViewTopPaneBackground instead

Author: Thomas1664

Files/Views/Pages/Properties.xaml

@@ -15,8 +15,7 @@
     mc:Ignorable="d">
 
     <Page.Resources>
-        <SolidColorBrush x:Key="NavigationViewExpandedPaneBackground" Color="Transparent" />
-        <SolidColorBrush x:Key="NavigationViewDefaultPaneBackground" Color="Transparent" />
+        <SolidColorBrush x:Key="NavigationViewTopPaneBackground" Color="Transparent" />
     </Page.Resources>
 
     <Grid>