Refined cirterion on decision of keeping or overwriting existing grid

velocities, should fix test case 'sine_gust'.

Author: ArneVoss

SU2_CFD/src/iteration/CFluidIteration.cpp

@@ -388,7 +388,7 @@ void CFluidIteration::SetWind_GustField(CConfig* config, CGeometry** geometry, C
 
     for (iPoint = 0; iPoint < geometry[iMGlevel]->GetnPoint(); iPoint++) {
       /*--- Reset the Grid Velocity to zero if there is no grid movement ---*/
-      if (Kind_Grid_Movement == GUST && !(config->GetFSI_Simulation()) && !(config->GetDynamic_Grid())) {
+      if (Kind_Grid_Movement == GUST && !(config->GetFSI_Simulation()) && !(config->GetDeform_Mesh())) {
         for (iDim = 0; iDim < nDim; iDim++) geometry[iMGlevel]->nodes->SetGridVel(iPoint, iDim, 0.0);
       }