pantheon.elementary-default-settings: install dockitem for appcenter

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

@@ -47,8 +47,7 @@ stdenv.mkDerivation rec {
   '';
 
   preInstall = ''
-    # Install our override for plank dockitems as Appcenter is not ready to be preinstalled.
-    # See: https://github.com/NixOS/nixpkgs/issues/70214.
+    # Install our override for plank dockitems as the desktop file path is different.
     schema_dir=$out/share/glib-2.0/schemas
     install -D ${./overrides/plank-dockitems.gschema.override} $schema_dir/plank-dockitems.gschema.override
 

pkgs/desktops/pantheon/desktop/elementary-default-settings/launchers/io.elementary.appcenter.dockitem

@@ -0,0 +1,2 @@
+[PlankDockItemPreferences]
+Launcher=file:///run/current-system/sw/share/applications/io.elementary.appcenter.desktop

pkgs/desktops/pantheon/desktop/elementary-default-settings/overrides/plank-dockitems.gschema.override

@@ -1,2 +1,2 @@
 [net.launchpad.plank.dock.settings]
-dock-items=['gala-multitaskingview.dockitem','org.gnome.Epiphany.dockitem','io.elementary.mail.dockitem','io.elementary.tasks.dockitem','io.elementary.calendar.dockitem','io.elementary.music.dockitem','io.elementary.videos.dockitem','io.elementary.photos.dockitem','io.elementary.switchboard.dockitem']
+dock-items=['gala-multitaskingview.dockitem','org.gnome.Epiphany.dockitem','io.elementary.mail.dockitem','io.elementary.tasks.dockitem','io.elementary.calendar.dockitem','io.elementary.music.dockitem','io.elementary.videos.dockitem','io.elementary.photos.dockitem','io.elementary.switchboard.dockitem','io.elementary.appcenter.dockitem']