Fixes #1014

When the double margin bug on cards were fixed it caused the shadow on dialogs to get cropped. Previously the default DialogMargin was 22, which when doubled left 44 units of space around the dialog's card (pleasnty for the 35 needed by shadow Depth5). But when that was cut it half the shadow was then clipped.

Author: Keboo

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.DialogHost.xaml

@@ -14,7 +14,7 @@
     </Style>
 
     <Style TargetType="{x:Type wpf:DialogHost}">
-        <Setter Property="DialogMargin" Value="22" />
+        <Setter Property="DialogMargin" Value="35" />
         <Setter Property="wpf:ShadowAssist.ShadowDepth" Value="Depth5" />
         <Setter Property="PopupStyle" Value="{StaticResource MaterialDesignDialogHostPopup}" />
         <Setter Property="Template">
@@ -192,7 +192,7 @@
     </Style>
 
     <Style x:Key="MaterialDesignEmbeddedDialogHost" TargetType="{x:Type wpf:DialogHost}">
-        <Setter Property="DialogMargin" Value="22" />
+        <Setter Property="DialogMargin" Value="35" />
         <Setter Property="wpf:ShadowAssist.ShadowDepth" Value="Depth5" />
         <Setter Property="HorizontalContentAlignment" Value="Center" />
         <Setter Property="VerticalContentAlignment" Value="Center" />