fix test where n_site is not provided any more

Author: bgctw

test/test_sample_zeta.jl

@@ -25,6 +25,8 @@ n_θM, n_θP = length.(values(get_hybridproblem_par_templates(prob; scenario)))
 
 (; xM, θP_true, θMs_true, xP, y_global_true, y_true, y_global_o, y_o
 ) = gen_hybridproblem_synthetic(rng, prob; scenario)
+n_site, n_batch = get_hybridproblem_n_site_and_batch(prob; scenario)
+
 
 FT = get_hybridproblem_float_type(prob; scenario)