nixos/openldap: fix eval

Fixes

error: The option value `meta.maintainers' in `nixos/modules/services/databases/openldap.nix' is not of type `list of maintainers'.

Changed files
+1 -1
nixos
modules
services
databases
+1 -1
nixos/modules/services/databases/openldap.nix
···
};
meta = {
-
maintainers = lib.maintainers.mic92;
+
maintainers = [ lib.maintainers.mic92 ];
};