Code Quality: Fixed pointer states on Omnibar clear button (#17230)

Author: yaira2

src/Files.App.Controls/Omnibar/Omnibar.xaml

@@ -375,7 +375,12 @@
 								FontSize="{StaticResource TextBoxIconFontSize}"
 								Foreground="{ThemeResource TextControlButtonForeground}"
 								IsTabStop="False"
-								Visibility="Collapsed" />
+								Visibility="Collapsed">
+								<Button.Resources>
+									<SolidColorBrush x:Key="ButtonBackgroundPointerOver" Color="{ThemeResource SubtleFillColorSecondary}" />
+									<SolidColorBrush x:Key="ButtonBackgroundPressed" Color="{ThemeResource SubtleFillColorTertiary}" />
+								</Button.Resources>
+							</Button>
 						</Grid>
 
 						<!--  Description  -->