[gtk/matthiasc/for-master] gtk-demo: Remove more gtk3-demo icon uses

[Matthias Clasen <matthiasc src gnome org>]

commit c6ef1943e400e0c075220520d807dbfd1a875b5f
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Nov 2 22:50:03 2020 -0500

    gtk-demo: Remove more gtk3-demo icon uses
    
    Use our own logo everywhere.

 demos/gtk-demo/demo.ui   | 2 +-
 demos/gtk-demo/listbox.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/demo.ui b/demos/gtk-demo/demo.ui
index 01847f8b92..22eccc535e 100644
--- a/demos/gtk-demo/demo.ui
+++ b/demos/gtk-demo/demo.ui
@@ -83,7 +83,7 @@
   </menu>
   <object class="GtkAboutDialog" id="aboutdialog1">
     <property name="program-name" translatable="yes">Builder demo</property>
-    <property name="logo-icon-name" translatable="yes">gtk3-demo</property>
+    <property name="logo-icon-name" translatable="yes">org.gtk.Demo4</property>
     <property name="modal">True</property>
   </object>
   <object class="GtkWindow" id="window1">
diff --git a/demos/gtk-demo/listbox.c b/demos/gtk-demo/listbox.c
index 3ec47c98e5..750f5f480c 100644
--- a/demos/gtk-demo/listbox.c
+++ b/demos/gtk-demo/listbox.c
@@ -197,7 +197,7 @@ gtk_message_row_update (GtkMessageRow *row)
 
   if (strcmp (priv->message->sender_nick, "@GTKtoolkit") == 0)
     {
-      gtk_image_set_from_icon_name (priv->avatar_image, "gtk3-demo");
+      gtk_image_set_from_icon_name (priv->avatar_image, "org.gtk.Demo4");
       gtk_image_set_icon_size (priv->avatar_image, GTK_ICON_SIZE_LARGE);
     }
   else