Fix build

native/Avalonia.Native/src/OSX/PlatformSettings.mm

@@ -25,7 +25,7 @@ public:
                 } else if (NSApplication.sharedApplication.effectiveAppearance.name == NSAppearanceNameAccessibilityHighContrastAqua
                     || NSApplication.sharedApplication.effectiveAppearance.name == NSAppearanceNameAccessibilityHighContrastVibrantLight) {
                     return AvnPlatformThemeVariant::HighContrastLight;
-                } else if (|| NSApplication.sharedApplication.effectiveAppearance.name == NSAppearanceNameAccessibilityHighContrastDarkAqua
+                } else if (NSApplication.sharedApplication.effectiveAppearance.name == NSAppearanceNameAccessibilityHighContrastDarkAqua
                     || NSApplication.sharedApplication.effectiveAppearance.name == NSAppearanceNameAccessibilityHighContrastVibrantDark) {
                     return AvnPlatformThemeVariant::HighContrastDark;
                 }

src/Windows/Avalonia.Win32/Win32PlatformSettings.cs

@@ -54,7 +54,7 @@ internal class Win32PlatformSettings : DefaultPlatformSettings
             using var highContrastScheme = new HStringInterop(accessibilitySettings.HighContrastScheme);
             return _lastColorValues = new PlatformColorValues
             {
-                ThemeVariant = highContrastScheme.Value?.Contains("White", StringComparison.OrdinalIgnoreCase) == true ?
+                ThemeVariant = highContrastScheme.Value?.Contains("White") == true ?
                     PlatformThemeVariant.Light :
                     PlatformThemeVariant.Dark,
                 ContrastPreference = ColorContrastPreference.High,