Revert "Open port for Calibre wireless connection"

This reverts commit 15462fdba4.

modules/networking.nix

@@ -40,9 +40,4 @@
     openFirewall = false;
     startWhenNeeded = true;
   };
-
-  # Firewall configuration
-  networking.firewall.allowedTCPPorts = [
-    9090 # Calibre
-  ];
 }