remove dodgy defqault margin

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.DatePicker.xaml

@@ -108,7 +108,7 @@
 		<Setter Property="SelectedDateFormat" Value="Short"/>
 		<Setter Property="BorderThickness" Value="0 0 0 1"/>
         <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
-        <Setter Property="Margin" Value="0 12 0 0" />
+        <Setter Property="Margin" Value="0 0 0 0" />
         <Setter Property="Validation.ErrorTemplate" Value="{StaticResource MaterialDesignValidationErrorTemplate}"/>
         <Setter Property="Template">
 			<Setter.Value>