[gnome-backgrounds] fix build

[Jakub Steiner <jimmac src gnome org>]

commit f97d079448d51fdbe0c878121a798982bd0256b2
Author: Jakub Steiner <jimmac gmail com>
Date:   Mon Oct 4 16:23:53 2021 +0200

    fix build

 backgrounds/meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/backgrounds/meson.build b/backgrounds/meson.build
index 2175a16..520416c 100644
--- a/backgrounds/meson.build
+++ b/backgrounds/meson.build
@@ -16,11 +16,11 @@ backgrounds = [
   'BrushStrokes.jpg',
   'ColdWarm.jpg',
   'Disco.jpg',
-  'DiscoHex.jpg',
   'Frosty.jpg',
   'Leaf.jpg',
   'LightBulb.jpg',
   'Loveles.jpg',
+  'pixels.png',
   'Symbolics-1.png',
   'VNC.png',
   'Wood.jpg'