Formula E said goodbye to the ExCeL, and Sébastien Buemi made sure the occasion counted. Two races, two top-five finishes, and a Season 12 closed out with the kind of pace Envision Racing had been missing since Tokyo. Saturday's qualifying left a bitter taste. Quick throughout Group B, the Swiss driver fell 0.08 seconds short of the duels and lined up tenth. Team-mate Joel Eriksson, third in his group, went out in…