Update PreviewPane.xaml

Author: yaira2

src/Files.App/UserControls/Pane/PreviewPane.xaml

@@ -326,6 +326,7 @@
 										HorizontalAlignment="Left"
 										x:Load="{x:Bind IsTag, Mode=OneWay}"
 										AutomationProperties.Name="{x:Bind AsTag.Tag.Name, Mode=OneWay}"
+										Background="{ThemeResource ControlAltFillColorSecondary}"
 										CornerRadius="12"
 										Orientation="Horizontal"
 										Spacing="8"