pantheon.epiphany: drop dark style preference patch

The vanilla epiphany already support dark style
preference in Pantheon, so no need to keep the patch.

pkgs/desktops/gnome/core/epiphany/default.nix

@@ -11,7 +11,6 @@
 , icu
 , wrapGAppsHook
 , gnome
-, pantheon
 , libportal-gtk3
 , libxml2
 , libxslt
@@ -52,13 +51,6 @@ stdenv.mkDerivation rec {
     # Pantheon specific patches for epiphany
     # https://github.com/elementary/browser
     #
-    # Make this respect dark mode settings from Pantheon
-    # https://github.com/elementary/browser/pull/21
-    # https://github.com/elementary/browser/pull/41
-    (fetchpatch {
-      url = "https://raw.githubusercontent.com/elementary/browser/cc17559a7ac6effe593712b4f3d0bbefde6e3b62/dark-style.patch";
-      sha256 = "sha256-RzMUc9P51UN3tRFefzRtMniXR9duOOmLj5eu5gL2TEQ=";
-    })
     # Patch to unlink nav buttons
     # https://github.com/elementary/browser/pull/18
     (fetchpatch {
@@ -87,7 +79,6 @@ stdenv.mkDerivation rec {
     glib
     glib-networking
     gnome-desktop
-    gnome.adwaita-icon-theme
     gst_all_1.gst-libav
     gst_all_1.gst-plugins-bad
     gst_all_1.gst-plugins-base
@@ -110,8 +101,6 @@ stdenv.mkDerivation rec {
     p11-kit
     sqlite
     webkitgtk
-  ] ++ lib.optionals withPantheon [
-    pantheon.granite
   ];
 
   # Tests need an X display