[gnome-chess] Replace deprecated properties to fix warning

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 24f7e003fd0541ab3fcd545b542f3b71b615bdfe
Author: Iulian Radu <iulian radu67 gmail com>
Date:   Sat Sep 20 23:59:19 2014 +0300

    Replace deprecated properties to fix warning
    
    https://bugzilla.gnome.org/show_bug.cgi?id=737045

 data/gnome-chess.ui |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/data/gnome-chess.ui b/data/gnome-chess.ui
index 15eba28..e2be90a 100644
--- a/data/gnome-chess.ui
+++ b/data/gnome-chess.ui
@@ -150,8 +150,8 @@
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
                 <property name="spacing">6</property>
-                <property name="margin-left">6</property>
-                <property name="margin-right">6</property>
+                <property name="margin-start">6</property>
+                <property name="margin-end">6</property>
                 <child>
                   <object class="GtkBox" id="left_nav_box">
                     <property name="visible">True</property>