paperwm: remove manually packaged extension

PaperWM became available on extensions.gnome.org at the end of July.
See: paperwm/PaperWM#569

pkgs/desktops/gnome/extensions/extensionRenames.nix

@@ -120,7 +120,6 @@
   "EasyScreenCast@iacopodeenosee.gmail.com" = "easyScreenCast"; # extensionPortalSlug is "easyscreencast"
   "gnome-fuzzy-app-search@gnome-shell-extensions.Czarlie.gitlab.com" = "fuzzy-app-search"; # extensionPortalSlug is "gnome-fuzzy-app-search"
   "TopIcons@phocean.net" = "topicons-plus"; # extensionPortalSlug is "topicons"
-  "paperwm@hedning:matrix.org" = "paperwm"; # is not on extensions.gnome.org
   "no-title-bar@jonaspoehler.de" = "no-title-bar"; # extensionPortalSlug is "no-title-bar-forked"
   # These extensions are automatically packaged at the moment. We preserve the old attribute name
   # for backwards compatibility.

pkgs/desktops/gnome/extensions/manuallyPackaged.nix

@@ -9,7 +9,6 @@
   "icon-hider@kalnitsky.org" = callPackage ./icon-hider { };
   "impatience@gfxmonk.net" = callPackage ./impatience { };
   "no-title-bar@jonaspoehler.de" = callPackage ./no-title-bar { };
-  "paperwm@hedning:matrix.org" = callPackage ./paperwm { };
   "pidgin@muffinmad" = callPackage ./pidgin-im-integration { };
   "pop-shell@system76.com" = callPackage ./pop-shell { };
   "sound-output-device-chooser@kgshank.net" = callPackage ./sound-output-device-chooser { };