fix call of num_threads in src

Appli-iso3dfd/src/dev05/iso-3dfd_parallel.cc

@@ -49,7 +49,7 @@ void iso_3dfd_it(float *ptr_next,  float *ptr_prev,  float *ptr_vel,   float *co
 	float *ptr_init_prev = ptr_prev;
 	float *ptr_init_vel = ptr_vel;
 	//To avoid the condition in the inner loop, we start at HALF_LENGTH and stop at dim-HALF_LENGTH
-	#pragma omp parallel for OMP_SCHEDULE num_threads(4) collapse(2) default(shared)	
+	#pragma omp parallel for OMP_SCHEDULE num_threads(num_threads) collapse(2) default(shared)	
 	for(int iz=HALF_LENGTH; iz<n3-HALF_LENGTH; iz++) {
 		for(int iy=HALF_LENGTH; iy<n2-HALF_LENGTH; iy++) {
 	#pragma omp simd