[gnome-control-center] online-accounts: Simplify setting the margin

[Debarshi Ray <debarshir src gnome org>]

commit be9687ce94d6888e505c04e055c0905ca9a92b41
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Jan 3 15:03:18 2017 +0100

    online-accounts: Simplify setting the margin
    
    https://bugzilla.gnome.org/show_bug.cgi?id=774222

 panels/online-accounts/online-accounts.ui |    5 +----
 1 files changed, 1 insertions(+), 4 deletions(-)
---
diff --git a/panels/online-accounts/online-accounts.ui b/panels/online-accounts/online-accounts.ui
index 9187442..18ca6c2 100644
--- a/panels/online-accounts/online-accounts.ui
+++ b/panels/online-accounts/online-accounts.ui
@@ -11,10 +11,7 @@
         <property name="spacing">18</property>
         <property name="border-width">8</property>
         <property name="orientation">vertical</property>
-        <property name="margin-start">6</property>
-        <property name="margin-end">6</property>
-        <property name="margin-top">6</property>
-        <property name="margin-bottom">6</property>
+        <property name="margin">6</property>
         <child>
           <object class="GtkLabel">
             <property name="visible">True</property>