Disable matrix free numdiff - it is stupid

test/poisson/poisson_matrix_free.mini

-__name = poisson_matrix_free_{__exec_suffix}
-__exec_suffix = numdiff, symdiff | expand num
+__name = poisson_matrix_free
 
 lowerleft = 0.0 0.0
 upperright = 1.0 1.0
@@ -12,7 +11,6 @@ reference = poisson_ref
 extension = vtu
 
 [formcompiler]
-numerical_jacobian = 1, 0 | expand num
 matrix_free = 1
 exact_solution_expression = g
 compare_l2errorsquared = 1e-6