Fix mri brightness contrast #746
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Define window width and window level based on 2-98 percentiles saturates the high pixel intensities that usually cause the image to and makes the brightness and contrast more similar across different types of scanners.
This fixes #745 the visualization issue only for MRIs imported with NIfTI, but not with DICOM.
Tested with 3 different MRIs that were previously being visualized very dark in InVesalius.