obsolete mine_cuckatoo_mean_cuda_31 test

[tromp]

We need tests for the new plugins mine_cuckatoo_mean_cuda_gtx_31 and mine_cuckatoo_mean_cuda_rtx_31,
that need to set config.params.expand = 2 as well.

[royal85]

not working on smOS so far but that's because the cuda plugins haven't been installed yet i think