[gnome-photos] export-dialog: Increase the dialog's border-width to 18

[Debarshi Ray <debarshir src gnome org>]

commit d059ee9dbcd8f90ebeebffb0385255e382dc4ec1
Author: Debarshi Ray <debarshir gnome org>
Date:   Mon Jul 25 07:53:46 2016 +0200

    export-dialog: Increase the dialog's border-width to 18
    
    This is the recommended value:
    https://developer.gnome.org/hig/stable/visual-layout.html.en

 src/photos-export-dialog.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/photos-export-dialog.ui b/src/photos-export-dialog.ui
index 84a6b88..1442f17 100644
--- a/src/photos-export-dialog.ui
+++ b/src/photos-export-dialog.ui
@@ -20,7 +20,7 @@
 -->
 <interface domain="gnome-photos">
   <template class="PhotosExportDialog" parent="GtkDialog">
-    <property name="border_width">5</property>
+    <property name="border_width">18</property>
     <property name="title" translatable="yes" context="dialog title">Export</property>
     <property name="resizable">0</property>
     <property name="modal">1</property>