[T] CT: Enable 2D heterogeneous comparison of V.

After removing the 3rd component from the Darcy velocity
and testing for a tight fit.

ProcessLib/ComponentTransport/Tests.cmake

@@ -319,7 +319,7 @@ AddTest(
     REQUIREMENTS NOT OGS_USE_MPI
     DIFF_DATA
     2D1P-GWFlow_1_reference.vtu out_ogs5_H_pcs_0_ts_1_t_10000000.000000.vtu pressure_OGS5 pressure 1e-1 1e-3
-    #2D1P-GWFlow_1_reference.vtu out_ogs5_H_pcs_0_ts_1_t_10000000.000000.vtu NODAL_VELOCITY1 darcy_velocity 1e-1 1e-10
+    2D1P-GWFlow_1_reference.vtu out_ogs5_H_pcs_0_ts_1_t_10000000.000000.vtu NODAL_VELOCITY1 darcy_velocity 2e-11 0
     VIS out_ogs5_H_pcs_0_ts_10_t_100000000.000000.vtu
 )
 
@@ -336,5 +336,3 @@ AddTest(
     3D1P-GWFlow_1_reference.vtu out_ogs5_H_pcs_0_ts_1_t_10000000.000000.vtu NODAL_VELOCITY1 darcy_velocity 1e-10 1.4e-2
     VIS out_ogs5_H_pcs_0_ts_1_t_10000000.000000.vtu
 )
-
-