[dconf-editor] Fix bookmarks rows rendering in Big Text.

[Arnaud Bonatti <arnaudb src gnome org>]

commit e8b56926f2d6439f3433c3f2d2b1eaff2749d588
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Aug 18 23:48:17 2016 +0200

    Fix bookmarks rows rendering in Big Text.

 editor/bookmark.ui |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/editor/bookmark.ui b/editor/bookmark.ui
index 09b0601..600dde9 100644
--- a/editor/bookmark.ui
+++ b/editor/bookmark.ui
@@ -18,6 +18,8 @@
       <object class="GtkButton" id="destroy_button">
         <property name="visible">True</property>
         <property name="margin">2</property>
+        <property name="valign">center</property>
+        <property name="vexpand">True</property>
         <style>
           <class name="image-button"/>
           <class name="circular"/>