Fix 2nd FT WG webex info for 2017-12 meeting
Fix 2nd FT WG webex info for 2017-12 meeting

Signed-off-by: Jeff Squyres <8d7f979c1534f5c44454845389099db3fe027b4b@cisco.com>

mpi-forum/mpi-forum.github.io,mpi-forum/mpi-forum.github.io,mpi-forum/mpi-forum.github.io,mpi-forum/mpi-forum.github.io,mpi-forum/mpi-forum.github.io