libifconfig: Fix nits in the descriptions of active 100G cables.

This is a cosmetic change affecting the "plugged: ..." line in the
output of ifconfig -v. Both the 100G active cables were missing a
closing parenthesis.

Sponsored by: Chelsio Communications

(cherry picked from commit 6460c327f6f3fdf2d1cd4db648baf6cb7d74828e)