psql: Change new \conninfo to use SSL instead of TLS

psql: Change new \conninfo to use SSL instead of TLS

Commit bba2fbc6238 introduced a new implementation of the \conninfo
command in psql.  That new code uses the term "TLS" while the rest of
PostgreSQL, including the rest of psql, consistently uses "SSL".  This
is uselessly confusing.  This changes the new code to use "SSL" as
well.

Reviewed-by: Alvaro Herrera <[email protected]>
Discussion: https://www.postgresql.org/message-id/f4ff9294-b491-4053-83f5-11c10ab8c999@eisentraut.org