Fix in back end for relax_disp.parameter_copy, where r2a and r2b should be skipped, since it has already been copied.
sr #3135(https://gna.org/support/?3135): Optimisation of the R1 relaxation rate for the off-resonance R1rho relaxation dispersion models.
Authored by: tlinnet 2014-08-12
Parent: [r25002]
Child: [r25004]
