gtk4: Fix incorrect merge

For some reason, 17a8a7deac re-introduced the patch, even though it was removed in ff29d2caa9.

pkgs/development/libraries/gtk/4.x.nix

@@ -2,7 +2,6 @@
 , stdenv
 , substituteAll
 , fetchurl
-, fetchpatch
 , pkg-config
 , gettext
 , graphene
@@ -78,15 +77,6 @@ stdenv.mkDerivation rec {
     sha256 = "p5orvMeTG3A/xPofy+G5BuIpoVIthU1SKAF2anm8rJ8=";
   };
 
-  patches = [
-    # Fix GNOME Control Center crash.
-    # https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/4670
-    (fetchpatch {
-      url = "https://gitlab.gnome.org/GNOME/gtk/-/commit/ae0166973795e750f08b89f9f0ef974d7ac48bc7.patch";
-      sha256 = "qPOplocE+RcTFIEveJe8YLKiUpe7o6CiA834rZpS0Fs=";
-    })
-  ];
-
   nativeBuildInputs = [
     gettext
     gobject-introspection