[ContextMenu] Fixed Dark Mode for Context Menu

PiperOrigin-RevId: 747912943

Author: Material Design Team

lib/java/com/google/android/material/theme/res/values/themes_base.xml

@@ -63,7 +63,7 @@
     <item name="dynamicColorThemeOverlay">@style/ThemeOverlay.Material3Expressive.DynamicColors.Light</item>
   </style>
 
-  <style name="Base.Theme.Material3Expressive.Dark" parent="Base.Theme.Material3.Light">
+  <style name="Base.Theme.Material3Expressive.Dark" parent="Base.Theme.Material3.Dark">
     <!-- Dialog themes. -->
     <item name="alertDialogTheme">@style/ThemeOverlay.Material3Expressive.Dialog.Alert</item>
     <item name="materialAlertDialogTheme">@style/ThemeOverlay.Material3Expressive.MaterialAlertDialog</item>