pantheon.elementary-greeter: hardcode elementary theme

For some reason correcting the path to the settings daemon
causes the icons to not be the elementary one's.

Hardcoding this fixes this very simply without
the need for the complicated wrapping.

pkgs/desktops/pantheon/desktop/elementary-greeter/default.nix

@@ -59,6 +59,7 @@ stdenv.mkDerivation rec {
       inherit numlockx;
     })
     ./01-sysconfdir-install.patch
+    ./hardcode-theme.patch
   ];
 
   mesonFlags = [
@@ -70,9 +71,6 @@ stdenv.mkDerivation rec {
 
   preFixup = ''
     gappsWrapperArgs+=(
-      # GTK+ reads default settings (such as icons and themes) from elementary's settings.ini here
-      --prefix XDG_CONFIG_DIRS : "${elementary-default-settings}/etc"
-
       # dbus-launch needed in path
       --prefix PATH : "${dbus}/bin"
 

pkgs/desktops/pantheon/desktop/elementary-greeter/hardcode-theme.patch

@@ -0,0 +1,15 @@
+diff --git a/src/PantheonGreeter.vala b/src/PantheonGreeter.vala
+index 11aa4c0..daf4a8a 100644
+--- a/src/PantheonGreeter.vala
++++ b/src/PantheonGreeter.vala
+@@ -474,6 +474,10 @@ public static int main (string [] args) {
+                                              Gdk.CursorType.LEFT_PTR);
+     Gdk.get_default_root_window ().set_cursor (cursor);
+
++    var settings = Gtk.Settings.get_default ();
++    settings.gtk_icon_theme_name = "elementary";
++    settings.gtk_theme_name = "elementary";
++
+     var icon_theme = Gtk.IconTheme.get_default ();
+     icon_theme.add_resource_path ("/io/elementary/greeter/icons");
+