Don't change sideset IDs in exo2nek

[aprilnovak]

The latest version of exo2nek changes the sideset IDs of the mesh, adding at least 100 to every sideset (and sometimes more if you are merging multiple meshes). The sideset IDs should remain untouched for nekRS, however, because the boundaryTypeMap parameter associates the boundary character ID (i.e. v, f, etc.) to the boundary with the same number as that character's position in the list. Therefore, the new exo2nek is incompatible with boundaryTypeMap.