Nix: Remove upstreamed skia fix from devshell

Author: https://github.com/ttrssreal
Commit: ea1997c631
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3427
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/gmta

shell.nix

@@ -4,15 +4,7 @@
 
 pkgs.mkShell {
   inputsFrom = [
-    (pkgs.ladybird.override (prev: {
+    pkgs.ladybird
-      # Apply fix expanding skia's public api
-      # See #4d7b717
-      skia = prev.skia.overrideAttrs (prev: {
-        gnFlags = prev.gnFlags ++ [
-          "extra_cflags+=[\"-DSKCMS_API=__attribute__((visibility(\\\"default\\\")))\"]"
-        ];
-      });
-    }))
   ];
 
   packages =