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/Views/MailRenderingPage.xaml

@@ -117,10 +117,7 @@
     </Page.Resources>
 
     <!--  Attachments and WebView2  -->
-    <Grid
-        x:Name="RendererGridFrame"
-        Padding="7,0"
-        RowSpacing="7">
+    <Grid x:Name="RendererGridFrame" RowSpacing="7">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto" />
             <RowDefinition Height="*" />