Remove variable numberOfStressBCnodes

...tructureInitializer/GridReaderGenerator/GridGenerator.cpp

src/gpu/VirtualFluids_GPU/GPU/LBMKernel.cu

src/gpu/VirtualFluids_GPU/KernelManager/LBKernelManager.cpp

src/gpu/VirtualFluids_GPU/Parameter/Parameter.h

...luids_GPU/PreCollisionInteractor/Probes/WallModelProbe.cu