v3dv: fix multiview with point size tests
This problem was detected after !12524 (merged) landed, as that MR fixes the point size granularity (so the bug was there but not detected).
For those tests the key->per_vertex_point_size for the geometry shader bin is set to false, as the nir shader doesn't write to it. This causes the vpm configuration to be wrong (as for those cases the point size is included) and a wrong rendering.