message: Edge-style separator margin (win)
diff: <Style x:Key="{x:Static MenuItem.SeparatorStyleKey}" TargetType="{x:Type Separator}">
  <Setter Property="Background" Value="{DynamicResource Toggl.CardBackground}" />
  <Setter Property="IsTabStop" Value="False" />
  - <Setter Property="Margin" Value="0 2" />
  + <Setter Property="Margin" Value="8 2" />
  <Setter Property="SnapsToDevicePixels" Value="True" />
  <Setter Property="Template">
  <Setter.Value>
  