[kernel] fix name of FC2D_NSGS solver
<!-- One Step NS Problem of th Simulation-->
<OneStepNSProblems_List>
<FrictionContact Type="2">
- <NonSmoothSolver Name="F2D_NSGS">
+ <NonSmoothSolver Name="FC2D_NSGS">
<iparam vectorSize='5'>101 0 0 0 0</iparam>
<dparam vectorSize='5'>1e-5 0 0 0 0</dparam>
</NonSmoothSolver>
