Fixed visual bug with margin in narrow state (#383)

* Reworked paddings/margins for mail list

* Fix composer page

* Moved layput changes from code behind to visual states

Wino.Mail/App.xaml

@@ -47,7 +47,6 @@
 
                     <!--  Border style for each page's root border for separation of zones.  -->
                     <Style x:Key="PageRootBorderStyle" TargetType="Border">
-                        <Setter Property="Margin" Value="7,0,7,7" />
                         <Setter Property="Background" Value="{ThemeResource WinoContentZoneBackgroud}" />
                         <Setter Property="BorderBrush" Value="{StaticResource CardStrokeColorDefaultBrush}" />
                         <Setter Property="CornerRadius" Value="7" />