nanshe/nanshe/nanshe_viewer.py: Drop use of keyword argument when calling the function add_singleton_axis_pos from expanded_numpy.
nanshe/nanshe/nanshe_viewer.py: Drop use of keyword argument when calling the function add_singleton_axis_pos from expanded_numpy.

jakirkham/nanshe,DudLab/nanshe,DudLab/nanshe,nanshe-org/nanshe,nanshe-org/nanshe,jakirkham/nanshe