CorrelatedField: fix for `total_N > 1`
The _Distributor used in CorrelatedFieldMaker.add_fluctuations via _Amplitude was broken.
It discarded input values during adjoint_times application if dofdex != np.arange(N_total).
The _Distributor used in CorrelatedFieldMaker.add_fluctuations via _Amplitude was broken.
It discarded input values during adjoint_times application if dofdex != np.arange(N_total).