Flip nv_uvm_pref_gpu default to false

Author: ntselepidis

src/simulation/m_global_parameters.fpp

@@ -586,7 +586,7 @@ contains
         ! NVIDIA UVM options
         nv_uvm_out_of_core = .false.
         nv_uvm_igr_temps_on_gpu = 3 ! => jac, jac_rhs, and jac_old on GPU (default)
-        nv_uvm_pref_gpu = .true.
+        nv_uvm_pref_gpu = .false.
 
         ! Simulation algorithm parameters
         model_eqns = dflt_int