[gnome-chess] Add padding to bottom row of widgets

[Michael Catanzaro <mcatanzaro src gnome org>]

commit c5b0419cd7386a3d5b0eec66ccf6fe6427e0f2cd
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed Feb 27 10:01:53 2019 -0600

    Add padding to bottom row of widgets
    
    Fixes #34

 data/gnome-chess.ui | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/data/gnome-chess.ui b/data/gnome-chess.ui
index a132bb9..f78a4a8 100644
--- a/data/gnome-chess.ui
+++ b/data/gnome-chess.ui
@@ -191,8 +191,7 @@
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
-                <property name="margin-start">6</property>
-                <property name="margin-end">6</property>
+                <property name="margin">6</property>
                 <child>
                   <object class="GtkBox" id="left_nav_box">
                     <property name="visible">True</property>