fix(flake): simplify preConfigure

flake.nix

@@ -29,7 +29,7 @@
             ldflags = [ "-s" "-w" ];
 
             # Remove stale vendor directory before buildGoModule deletes it.
-            preConfigure = "find vendor -type f -exec chmod 666 {} \; 2>/dev/null || true; rm -rf vendor 2>/dev/null || find vendor -delete 2>/dev/null || true";
+            preConfigure = "rm -rf vendor || true";
 
             nativeCheckInputs = with pkgs; [ ];