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Exclude ghost layer from collision in free-surface LBM

Merged Christoph Schwarzmeier requested to merge exclude-ghostlayer-collide-free-surface into master

In the free-surface LBM implementation, the collision is currently also performed in the first ghost layer when using a code-generated kernel from lbmpy. Performing the collision in the ghost layer is not necessary, and is also not done in LBM kernels from waLBerla.

This MR excludes the ghost layer from the collision.