Fix tab background color in dark mode when pointer over (#824)

Author: tsvietOK

Files/App.xaml

@@ -27,7 +27,7 @@
                             <SolidColorBrush x:Key="YourHomeCardBorderColor" Color="White" />
                             <SolidColorBrush x:Key="TabViewBackground" Color="Black" />
                             <SolidColorBrush x:Key="TabViewItemHeaderBackgroundSelected" Color="#191919" />
-                            <SolidColorBrush x:Key="TabViewItemHeaderBackgroundPointerOver" Color="#191919" />
+                            <SolidColorBrush x:Key="TabViewItemHeaderBackgroundPointerOver" Color="#80191919" />
                             <SolidColorBrush x:Key="TabViewItemHeaderBackgroundPressed" Color="#191919" />
                             <SolidColorBrush x:Key="CustomInputFieldBorderBrush" Color="#FF363636" />
                             <SolidColorBrush x:Key="RibbonBackgroundColor" Color="#131313" />