Remove uneeded additions to nominal_width
Remove uneeded additions to nominal_width

getMaxCoreDiameter already includes the maximum width needed for any particle-particle
interactions and takes into account the overlap matrix.

joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue,joaander/hoomd-blue