[gnome-calendar] edit-dialog: correctly center header button widgets

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

commit f8876022e1afea5bd8882aa0e5ef3149654017cb
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Fri Jul 8 16:39:01 2016 -0300

    edit-dialog: correctly center header button widgets

 data/ui/edit-dialog.ui |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/data/ui/edit-dialog.ui b/data/ui/edit-dialog.ui
index e26e54a..7275353 100644
--- a/data/ui/edit-dialog.ui
+++ b/data/ui/edit-dialog.ui
@@ -51,7 +51,6 @@
                   <object class="GtkImage" id="source_image">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="valign">start</property>
                     <style>
                       <class name="calendar-color-image"/>
                     </style>
@@ -62,6 +61,7 @@
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
                     <property name="orientation">vertical</property>
+                    <property name="valign">center</property>
                     <child>
                       <object class="GtkLabel" id="title_label">
                         <property name="visible">True</property>
@@ -87,7 +87,6 @@
                   <object class="GtkImage" id="pan_down_image">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="valign">start</property>
                     <property name="icon_name">pan-down-symbolic</property>
                   </object>
                 </child>