nixos/ombi: set ombi as system user

Changed files
+1
nixos
modules
services
misc
+1
nixos/modules/services/misc/ombi.nix
···
users.users = mkIf (cfg.user == "ombi") {
ombi = {
group = cfg.group;
home = cfg.dataDir;
};
···
users.users = mkIf (cfg.user == "ombi") {
ombi = {
+
isSystemUser = true;
group = cfg.group;
home = cfg.dataDir;
};