[gtk] a11y tests: Update assistant ui file

[Matthias Clasen <matthiasc src gnome org>]

commit 4dc3595e2c2f3fcc24976466e28eb947dfe234cf
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Feb 8 09:51:02 2019 -0500

    a11y tests: Update assistant ui file
    
    The conversion was done with gtk-builder-tool simplify --3to4.

 testsuite/a11y/assistant.ui | 33 ++++++++++++++++-----------------
 1 file changed, 16 insertions(+), 17 deletions(-)
---
diff --git a/testsuite/a11y/assistant.ui b/testsuite/a11y/assistant.ui
index aed2044489..dfe2785526 100644
--- a/testsuite/a11y/assistant.ui
+++ b/testsuite/a11y/assistant.ui
@@ -1,28 +1,27 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <interface>
-  <!-- interface-requires gtk+ 3.0 -->
   <object class="GtkAssistant" id="window1">
-    <property name="can_focus">False</property>
     <property name="type">popup</property>
     <child>
-      <object class="GtkButton" id="button1">
-        <property name="label" translatable="yes">Button 1</property>
-        <property name="visible">True</property>
-        <property name="can_focus">True</property>
-      </object>
-      <packing>
+      <object class="GtkAssistantPage">
         <property name="title" translatable="yes">Page 1</property>
-      </packing>
+        <property name="child">
+          <object class="GtkButton" id="button1">
+            <property name="label" translatable="yes">Button 1</property>
+            <property name="can_focus">1</property>
+          </object>
+        </property>
+      </object>
     </child>
     <child>
-      <object class="GtkButton" id="button2">
-        <property name="label" translatable="yes">Button 2</property>
-        <property name="visible">True</property>
-        <property name="can_focus">True</property>
-      </object>
-      <packing>
+      <object class="GtkAssistantPage">
         <property name="title" translatable="yes">Page 2</property>
-      </packing>
+        <property name="child">
+          <object class="GtkButton" id="button2">
+            <property name="label" translatable="yes">Button 2</property>
+            <property name="can_focus">1</property>
+          </object>
+        </property>
+      </object>
     </child>
   </object>
 </interface>