[gnome-chess] Remove extra margin between board and controls

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 6918723d47a22a274ca46b9ec375a43629bdb9e7
Author: Brian Daniels <brianddaniels gmail com>
Date:   Sun Sep 8 13:08:48 2019 -0500

    Remove extra margin between board and controls

 data/gnome-chess.ui | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/data/gnome-chess.ui b/data/gnome-chess.ui
index 5f39539..ffe194f 100644
--- a/data/gnome-chess.ui
+++ b/data/gnome-chess.ui
@@ -191,7 +191,9 @@
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
-                <property name="margin">6</property>
+                <property name="margin-left">6</property>
+                <property name="margin-right">6</property>
+                <property name="margin-bottom">6</property>
                 <child>
                   <object class="GtkBox" id="history_box">
                     <property name="visible">True</property>