Move age.identityPaths to desktop profile

The management server doesn't like when it is in common

modules/misc/common/default.nix

@@ -10,7 +10,6 @@ let
   system = pkgs.system;
 in
 {
-  age.identityPaths = [ "/home/${config.az-username}/.ssh/id_rsa" ];
   # The rough location
   location = {
     latitude = 46.948;

modules/profiles/desktop/default.nix

@@ -22,6 +22,7 @@ in
       nixos.includeAllModules = true;
     };
 
+    age.identityPaths = [ "/home/${config.az-username}/.ssh/id_rsa" ];
     services = {
       az-docker.enable = true;
       az-pipewire.enable = true;