Add nextcloud-talk-desktop package

Grabbed from this PR but modified so that it will actually work:
https://github.com/NixOS/nixpkgs/pull/302781

home-default.nix

@@ -1,6 +1,9 @@
 { config, pkgs, lib, ... }:
 
 with import <nixpkgs> {};
+let
+  nextcloudTalkDesktop = pkgs.callPackage ./modules/applications/nextcloud-talk-desktop/package.nix {};
+in
 {
   # Home Manager needs a bit of information about you and the paths it should
   # manage.
@@ -56,6 +59,8 @@ with import <nixpkgs> {};
     pkgs.waybar
     pkgs.wofi
     pkgs.vlc
+
+    nextcloudTalkDesktop
   ];
 
   # Home Manager is pretty good at managing dotfiles. The primary way to manage