message: Handle code review comment
diff: xmlns:behaviors="clr-namespace:TogglDesktop.Behaviors"
  xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
  xmlns:i="http://schemas.microsoft.com/xaml/behaviors"
  - mc:Ignorable="d" MinWidth="300">
  + mc:Ignorable="d" MinWidth="320">
  <Grid Background="{DynamicResource Toggl.CardBackground}">
  <Grid Name="contentGrid" x:FieldModifier="private" Margin="28 20">
  <Grid.RowDefinitions>
  <RowDefinition Height="Auto"/>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
  - <ColumnDefinition Width="19*" />
  - <ColumnDefinition Width="18*"/>
  + <ColumnDefinition Width="21*" />
  + <ColumnDefinition Width="17*"/>
  <ColumnDefinition Width="Auto"/>
  - <ColumnDefinition Width="18*" />
  + <ColumnDefinition Width="17*" />
  </Grid.ColumnDefinitions>
  <TextBlock Style="{DynamicResource Toggl.BodyText}" Margin="0 0 0 8" Text="Duration" />
  <toggl:ExtendedTextBox x:Name="durationTextBox" x:FieldModifier="private" Grid.Row="1" Grid.Column="0"
  