Fix bug and rename fastdgf tests

This makes the order of 'gradvec' and 'quadvec' consistent with the
other tests.

python/dune/perftool/sumfact/basis.py

@@ -94,7 +94,7 @@ def pymbolic_trialfunction_gradient(element, restriction, component, visitor):
             insn_dep = frozenset({Writes(inp)})
 
         # TODO: fastdg and vectorization
-        if get_option('fastdg') and index is not None:
+        if get_option('fastdg') and index is None:
             # Name of direct input, shape and globalarg is set in sum_factorization_kernel
             direct_input = name_coefficientcontainer(restriction)
         else:

test/sumfact/poisson/poisson_fastdg.mini

 __name = sumfact_poisson_fastdg_{__exec_suffix}
-__exec_suffix = {gradvec_suffix}_{quadvec_suffix}
+__exec_suffix = {quadvec_suffix}_{gradvec_suffix}
 
-gradvec_suffix = gradvec, nongradvec | expand gradvec
 quadvec_suffix = quadvec, nonquadvec | expand quadvec
+gradvec_suffix = gradvec, nongradvec | expand gradvec
 
 cells = 16 16
 extension = 1. 1.