message: Fix Preferences background color (win)
diff: <Setter Property="mah:TabControlHelper.UnderlineMouseOverBrush" Value="{DynamicResource Toggl.SecondaryTextBrush}" />
  <Setter Property="mah:TabControlHelper.UnderlineMouseOverSelectedBrush" Value="{DynamicResource Toggl.AccentBrush}" />
  <Setter Property="mah:TabControlHelper.UnderlineSelectedBrush" Value="{DynamicResource Toggl.AccentBrush}" />
  - <Setter Property="Background" Value="{DynamicResource Toggl.CardBackground}" />
  + <Setter Property="Background" Value="{DynamicResource Toggl.Background}" />
  <Setter Property="Template">
  <Setter.Value>
  <ControlTemplate TargetType="{x:Type TabControl}">
  <Setter Property="FontFamily" Value="{StaticResource BaseFont}" />
  <Setter Property="Foreground" Value="{DynamicResource Toggl.SecondaryTextBrush}" />
  <Setter Property="Padding" Value="0 2" />
  + <Setter Property="Background" Value="{DynamicResource Toggl.CardBackground}" />
  <Setter Property="Template">
  <Setter.Value>
  <ControlTemplate TargetType="TabItem">
  