fix post_process build

Author: wilfonba

src/post_process/m_start_up.f90

@@ -82,7 +82,7 @@ subroutine s_read_input_file
             polydisperse, poly_sigma, file_per_process, relax, &
             relax_model, cf_wrt, sigma, adv_n, ib, num_ibs, &
             cfl_adap_dt, cfl_const_dt, t_save, t_stop, n_start, &
-            cfl_target, surface_tension &
+            cfl_target, surface_tension, &
             sim_data, hyperelasticity
 
         ! Inquiring the status of the post_process.inp file