message: Add margin before the empty textbox text of login/password fields (win)
diff: <Setter Property="VerticalAlignment" Value="Stretch" />
  </Style>
  <Style x:Key="LoginTextBoxEmptyLabel" TargetType="Label" BasedOn="{StaticResource LoginTextBoxLabelShared}">
  + <Setter Property="Margin" Value="3,0,0,0" />
  <Setter Property="IsHitTestVisible" Value="False" />
  <Setter Property="Panel.ZIndex" Value="1" />
  <Setter Property="Foreground" Value="#a1a1a1" />
  