ux: margins for group_expander

Author: love-linger

src/Resources/Styles.axaml

@@ -985,7 +985,7 @@
   </Style>
 
   <Style Selector="ToggleButton.group_expander">
-    <Setter Property="Margin" Value="8,0,0,0"/>
+    <Setter Property="Margin" Value="6,0,0,0"/>
     <Setter Property="Padding" Value="0"/>
     <Setter Property="Background" Value="Transparent"/>
     <Setter Property="HorizontalAlignment" Value="Stretch"/>