Fix to systemtest Relax_disp.test_r1rho_kjaergaard_missing_r1()
After the relaxation times have been fixed, this model now return reasonable chi2 values.
The reported parameters are though quite different from all other models, and it seems something may
still be wrong.
bug #22461(https://gna.org/bugs/?22461): NS R1rho 2-site_fit_r1 has extremely high chi2 value in systemtest Relax_disp.test_r1rho_kjaergaard_missing_r1.
