message: Fix popup's horizontal offset (win)
diff: </TextBlock>
  <Popup x:Name="popup" x:FieldModifier="private"
  AllowsTransparency="True"
  - StaysOpen="False">
  + StaysOpen="False"
  + HorizontalOffset="-4">
  <Grid Background="Transparent">
  <Border Margin="4"
  BorderBrush="{DynamicResource Toggl.LightGrayBrush}"
  