[gtk/theme-reorg] Change the default theme to "Default"

[Matthias Clasen <matthiasc src gnome org>]

commit 17f29cc69364bec4de1bc99b255b31566569809b
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 15 00:57:15 2021 -0500

    Change the default theme to "Default"
    
    We are not shipping Adwaita anymore.

 gtk/gtksettingsprivate.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtksettingsprivate.h b/gtk/gtksettingsprivate.h
index ec41b8fa6b..21af69d3dc 100644
--- a/gtk/gtksettingsprivate.h
+++ b/gtk/gtksettingsprivate.h
@@ -23,7 +23,7 @@
 
 G_BEGIN_DECLS
 
-#define DEFAULT_THEME_NAME      "Adwaita"
+#define DEFAULT_THEME_NAME      "Default"
 #define DEFAULT_ICON_THEME      "Adwaita"
 
 const cairo_font_options_t *