[totem] backend: Re-flatten the volume button

[Bastien Nocera <hadess src gnome org>]

commit 5208baf642701757a0f6de5030183734b93fc3f0
Author: Bastien Nocera <hadess hadess net>
Date:   Mon Aug 31 16:57:44 2015 +0200

    backend: Re-flatten the volume button
    
    It's supposed to be flat.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=748306

 data/controls.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/controls.ui b/data/controls.ui
index e79f956..c017f7e 100644
--- a/data/controls.ui
+++ b/data/controls.ui
@@ -143,7 +143,7 @@
                     <property name="can_focus">True</property>
                     <property name="receives_default">True</property>
                     <property name="has_tooltip">True</property>
-                    <property name="relief">normal</property>
+                    <property name="relief">none</property>
                     <property name="focus_on_click">False</property>
                     <property name="orientation">vertical</property>
                     <property name="valign">center</property>