Revert "MINOR: quic: use dynamic cc_algo on bind_conf"

Revert "MINOR: quic: use dynamic cc_algo on bind_conf"

This reverts commit a6504c9cfb6bb48ae93babb76a2ab10ddb014a79.

Each supported QUIC algo are associated with a set of callbacks defined
in a structure quic_cc_algo. Originally, bind_conf would use a constant
pointer to one of these definitions.

During pacing implementation, this field was transformed into a
dynamically allocated value copied from the original definition. The
idea was to be able to tweak settings at the listener level. However,
this was never used in practice. As such, revert to the original model.

This may need to be backported to support QUIC congestion control
algorithm support on the server line in version 3.3.