[shotwell] piwigo: Fix deprecation in publishing pane

[Jens Georg <jensgeorg src gnome org>]

commit c62bd9131c25a6f0270534d62009c943bae5dd5b
Author: Jens Georg <mail jensge org>
Date:   Wed Jan 23 10:42:14 2019 +0100

    piwigo: Fix deprecation in publishing pane

 plugins/shotwell-publishing/piwigo_publishing_options_pane.ui | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/plugins/shotwell-publishing/piwigo_publishing_options_pane.ui 
b/plugins/shotwell-publishing/piwigo_publishing_options_pane.ui
index 397d2ec9..50f43030 100644
--- a/plugins/shotwell-publishing/piwigo_publishing_options_pane.ui
+++ b/plugins/shotwell-publishing/piwigo_publishing_options_pane.ui
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.20.0 -->
+<!-- Generated with glade 3.22.0 -->
 <interface domain="shotwell">
   <requires lib="gtk+" version="3.14"/>
   <object class="GtkWindow" id="publishing_options_pane">
@@ -8,8 +8,8 @@
       <object class="GtkBox" id="content">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="margin_left">10</property>
-        <property name="margin_right">10</property>
+        <property name="margin_start">10</property>
+        <property name="margin_end">10</property>
         <property name="orientation">vertical</property>
         <property name="spacing">12</property>
         <child>
@@ -285,5 +285,8 @@
         </child>
       </object>
     </child>
+    <child type="titlebar">
+      <placeholder/>
+    </child>
   </object>
 </interface>