fix: swww error

hosts/desktop/wm.nix

@@ -32,7 +32,7 @@ in
   ];
   options.wm = with lib; with lib.types; {
     wallpaper = mkOption {
-      default = ../../static/guz-wallpaper-default.webp;
+      default = ../../static/guz-wallpaper-default.png;
       type = path;
     };
   };

hosts/desktop/work/home.nix

@@ -6,7 +6,7 @@
   ];
 
   theme.accent = "94e2d5";
-  wm.wallpaper = ../../../static/guz-wallpaper-work.webp;
+  wm.wallpaper = ../../../static/guz-wallpaper-work.png;
   librewolf.profiles.work = {
     isDefault = true;
     id = 1;