tests/test_advanced_image_processing.py: Changed percentage_pixels_below_max in the config variable in test_postprocess_data_2 to a floating point value.
tests/test_advanced_image_processing.py: Changed percentage_pixels_below_max in the config variable in test_postprocess_data_2 to a floating point value.

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