Update parameters in HarmonicDihedralForceComputeGPU.cc with p_0, not just 0.0
Update parameters in HarmonicDihedralForceComputeGPU.cc with p_0, not just 0.0

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