nixos/cinnamon: Replace xplayer with celluloid

https://github.com/linuxmint/xplayer/issues/169#issuecomment-1072069928

nixos/doc/manual/release-notes/rl-2505.section.md

···
 
 - Cinnamon has been updated to 6.4, please check the [upstream announcement](https://www.linuxmint.com/rel_xia_whatsnew.php) for more details.
   - Following [changes in Mint 22](https://github.com/linuxmint/mintupgrade/commit/f239cde908288b8c250f938e7311c7ffbc16bd59) we are no longer overriding Qt application styles. You can still restore the previous default with `qt.style = "gtk2"` and `qt.platformTheme = "gtk2"`.
+  - Following [changes in Mint 20](https://github.com/linuxmint/mintupgrade-legacy/commit/ce15d946ed9a8cb8444abd25088edd824bfb18f6) we are replacing xplayer with celluloid since xplayer is no longer maintained.
 
 - Xfce has been updated to 4.20, please check the [upstream feature tour](https://www.xfce.org/about/tour420) for more details.
   - Wayland session is still [experimental](https://wiki.xfce.org/releng/wayland_roadmap) and requires opt-in using `enableWaylandSession` option.

nixos/modules/services/x11/desktop-managers/cinnamon.nix

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         xviewer
         xreader
         xed-editor
-        xplayer
         pix
 
         # external apps shipped with linux-mint
+        celluloid
         gnome-calculator
         gnome-calendar
         gnome-screenshot