jellyfin: patch port 8096 being open

All jellyfin traffic should actually go through caddy.
This port being open caused a lot of confusion for me.
As I was getting traffic from typo'd domain names,
such as `jellfin.gardling.com`, which made NO SENSE!
But since it was going directly via port 8096, it
skipped caddy entirely so the traffic went through.

services/jellyfin.nix

@@ -19,8 +19,6 @@
 
   services.jellyfin = {
     enable = true;
-    # used for local streaming
-    openFirewall = true;
     package = pkgs.jellyfin.override { jellyfin-ffmpeg = (lib.optimizePackage pkgs.jellyfin-ffmpeg); };
 
     inherit (service_configs.jellyfin) dataDir cacheDir;