Compilation error when `NN_FIXED_POINT_IMPLEMENTATION` set to 0.

When compiling the HEAD of VTM-11-NNVC (commit 8241b681) with NN_FIXED_POINT_IMPLEMENTATION at 0, the compilation crashes at this line https://vcgit.hhi.fraunhofer.de/jvet-ahg-nnvc/VVCSoftware_VTM/-/blob/VTM-11.0_nnvc/source/Lib/CommonLib/NNSuperResolution.cpp#L256 and this line https://vcgit.hhi.fraunhofer.de/jvet-ahg-nnvc/VVCSoftware_VTM/-/blob/VTM-11.0_nnvc/source/Lib/CommonLib/NNSuperResolution.cpp#L257 because pos_x and pos_y are unused variables.