[nautilus] preferences-dialog: fix unwanted 2px border

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit ca5d997521c156ccb90b25607d9ea6bf0c899c3a
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Feb 3 18:59:15 2016 -0200

    preferences-dialog: fix unwanted 2px border
    
    This commit removes the annoying 2px border added to
    the dialog's internal-vbox when not explicitly asking
    for a 0px border.

 src/resources/ui/nautilus-preferences-dialog.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/resources/ui/nautilus-preferences-dialog.ui b/src/resources/ui/nautilus-preferences-dialog.ui
index 3fa6e48..977ce12 100644
--- a/src/resources/ui/nautilus-preferences-dialog.ui
+++ b/src/resources/ui/nautilus-preferences-dialog.ui
@@ -177,6 +177,7 @@
         <property name="can_focus">False</property>
         <property name="orientation">vertical</property>
         <property name="spacing">2</property>
+        <property name="border_width">0</property>
         <child internal-child="action_area">
           <object class="GtkButtonBox" id="dialog-action_area1">
             <property name="can_focus">False</property>