Fix SASL negotiation with v3.2 CAP
The IRCv3.2 specification allows servers to specify capability values with CAP LS, but it does not allow clients to specify them.
This was breaking SASL authentication and connections with inspircd.
The IRCv3.2 specification allows servers to specify capability values with CAP LS, but it does not allow clients to specify them.
This was breaking SASL authentication and connections with inspircd.