message: Add focus visual style for red accent button (win)
diff: </Setter>
  </Style>
  + <Style x:Key="Toggl.SecondaryAccentButtonFocusVisualStyle">
  + <Setter Property="Control.Template">
  + <Setter.Value>
  + <ControlTemplate>
  + <Border BorderThickness="1"
  + BorderBrush="{DynamicResource Toggl.Button.Accent.Red.PressedBackground}">
  + <Rectangle SnapsToDevicePixels="True"
  + StrokeThickness="1"
  + UseLayoutRounding="True">
  + <Rectangle.Stroke>
  + <SolidColorBrush Color="{DynamicResource Toggl.SelectionElements.BackgroundColor}" Opacity="0.6" />
  + </Rectangle.Stroke>
  + </Rectangle>
  + </Border>
  + </ControlTemplate>
  + </Setter.Value>
  + </Setter>
  + </Style>
  +
  +
  <Style x:Key="Toggl.PrimaryButton" TargetType="{x:Type Button}">
  <Setter Property="Background" Value="{DynamicResource Toggl.Button.Primary.Background}" />
  <Setter Property="BorderThickness" Value="1" />
  <Style TargetType="Button" x:Key="Toggl.SecondaryAccentButton" BasedOn="{StaticResource Toggl.AccentButton}">
  <Setter Property="Background" Value="{DynamicResource Toggl.SecondaryAccentBrush}" />
  + <Setter Property="FocusVisualStyle" Value="{StaticResource Toggl.SecondaryAccentButtonFocusVisualStyle}" />
  <Style.Triggers>
  <Trigger Property="IsMouseOver" Value="True">
  <Setter Property="BorderBrush" Value="{DynamicResource Toggl.Button.Accent.Red.MouseOverBorder}" />
  