chore: remove useless brushes.

src/Avalonia/HandyControl_Avalonia/Themes/Basic/Brushes.axaml

@@ -111,53 +111,4 @@
                      Color="{DynamicResource DarkMaskColor}" />
     <SolidColorBrush x:Key="DarkOpacityBrush"
                      Color="{DynamicResource DarkOpacityColor}" />
-
-
-    <SolidColorBrush x:Key="ThemeBackgroundBrush"
-                     Color="{DynamicResource ThemeBackgroundColor}" />
-    <SolidColorBrush x:Key="ThemeBorderLowBrush"
-                     Color="{DynamicResource ThemeBorderLowColor}" />
-    <SolidColorBrush x:Key="ThemeBorderMidBrush"
-                     Color="{DynamicResource ThemeBorderMidColor}" />
-    <SolidColorBrush x:Key="ThemeBorderHighBrush"
-                     Color="{DynamicResource ThemeBorderHighColor}" />
-    <SolidColorBrush x:Key="ThemeControlLowBrush"
-                     Color="{DynamicResource ThemeControlLowColor}" />
-    <SolidColorBrush x:Key="ThemeControlMidBrush"
-                     Color="{DynamicResource ThemeControlMidColor}" />
-    <SolidColorBrush x:Key="ThemeControlMidHighBrush"
-                     Color="{DynamicResource ThemeControlMidHighColor}" />
-    <SolidColorBrush x:Key="ThemeControlHighBrush"
-                     Color="{DynamicResource ThemeControlHighColor}" />
-    <SolidColorBrush x:Key="ThemeControlVeryHighBrush"
-                     Color="{DynamicResource ThemeControlVeryHighColor}" />
-    <SolidColorBrush x:Key="ThemeControlHighlightLowBrush"
-                     Color="{DynamicResource ThemeControlHighlightLowColor}" />
-    <SolidColorBrush x:Key="ThemeControlHighlightMidBrush"
-                     Color="{DynamicResource ThemeControlHighlightMidColor}" />
-    <SolidColorBrush x:Key="ThemeControlHighlightHighBrush"
-                     Color="{DynamicResource ThemeControlHighlightHighColor}" />
-    <SolidColorBrush x:Key="ThemeForegroundBrush"
-                     Color="{DynamicResource ThemeForegroundColor}" />
-    <SolidColorBrush x:Key="HighlightBrush"
-                     Color="{DynamicResource HighlightColor}" />
-    <SolidColorBrush x:Key="HighlightBrush2"
-                     Color="{DynamicResource HighlightColor2}" />
-    <SolidColorBrush x:Key="HyperlinkVisitedBrush"
-                     Color="{DynamicResource HyperlinkVisitedColor}" />
-
-    <SolidColorBrush x:Key="RefreshVisualizerForeground"
-                     Color="Black" />
-    <SolidColorBrush x:Key="RefreshVisualizerBackground"
-                     Color="Transparent" />
-
-
-    <!-- BaseResources for CaptionButtons.xaml -->
-    <SolidColorBrush x:Key="CaptionButtonForeground"
-                     Color="Black" />
-    <SolidColorBrush x:Key="CaptionButtonBackground"
-                     Color="#ffe5e5e5" />
-    <SolidColorBrush x:Key="CaptionButtonBorderBrush"
-                     Color="#ffcacaca" />
-
 </ResourceDictionary>