suzerain: drop order to speed tests

Piecewise 7th order and piecewise 5th order should be
equally good for coverage, and the latter runs faster.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43998 0bd85f0b-c151-43b9-a1e9-27231104551f