[gnome-clocks] world-standalone: Use plain GtkHeaderBar

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

commit 495d807d9846abe5b06e6f7e8ad8e19674b3f1f6
Author: Maximiliano Sandoval R <msandova gnome org>
Date:   Tue Dec 14 01:06:59 2021 +0100

    world-standalone: Use plain GtkHeaderBar

 data/ui/world-standalone.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/ui/world-standalone.ui b/data/ui/world-standalone.ui
index ceaad90f..515a0f8e 100644
--- a/data/ui/world-standalone.ui
+++ b/data/ui/world-standalone.ui
@@ -4,7 +4,7 @@
     <property name="orientation">vertical</property>
     <signal name="notify::location" handler="location_changed"/>
     <child>
-      <object class="AdwHeaderBar">
+      <object class="GtkHeaderBar">
         <property name="title-widget">
           <object class="AdwWindowTitle">
             <property name="title" bind-source="ClocksWorldStandalone" bind-property="title" 
bind-flags="sync-create" />