Permuted high-symmetry labels in the susceptibility tutorial

[HugoStrand]

The X and M points along the high symmetry path are swapped in the plot in the DMFT lattice susceptibility tutorial, see

https://triqs.github.io/tprf/latest/user_guide/dmft_susceptibility/dmft_susceptibility.html#lattice-bethe-salpeter-equation

Thank you Hao Lu for reporting this.