Simplify maximum limit of direct messages specs
Simplify maximum limit of direct messages specs

Now the tests are easier to understand: when the limit is 3, if you
create 3, the fourth one is invalid. If you create 2, the third one is
valid.

consul/consul,usabi/consul_san_borondon,consul/consul,usabi/consul_san_borondon,usabi/consul_san_borondon,consul/consul,consul/consul,usabi/consul_san_borondon,consul/consul