show prior on 1D histogram plots
The purpose of this MR is to fix a bug introduced in 8bb1c480 where the prior is plotted with histtype='step' (coming from _default_hist_kwargs) and edgecolor='w' meaning that it is not visible on the figure.
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The purpose of this MR is to fix a bug introduced in 8bb1c480 where the prior is plotted with histtype='step' (coming from _default_hist_kwargs) and edgecolor='w' meaning that it is not visible on the figure.