[FIX] pe benchmark

apps/benchmarks/GranularGas/PE_Benchmark.cfg

@@ -12,6 +12,7 @@ GranularGas
 
    dt                0.1;
    simulationSteps   1000;
+   numOuterIterations   1;
    visSpacing         100;
 
    HCSITSmaxIterations 10;

apps/benchmarks/GranularGas/PE_GranularGas.cpp

@@ -286,7 +286,7 @@ int main( int argc, char ** argv )
 
          auto bodyIt = localStorage.begin();
          for (auto it = grid_generator::SCIterator(currentBlock.getAABB().getIntersection(generationDomain),
-                                                   Vector3<real_t>(params.spacing) * real_c(0.5),
+                                                   Vector3<real_t>(params.spacing) * real_c(0.5) + params.shift,
                                                    params.spacing);
               it != grid_generator::SCIterator();
               ++it, ++bodyIt)