BUG: change output type to float

Sam Horvathrequested to merge
github/fork/fedorov/n4itk-output-float-only into master

Created by: fedorov

Cast of the output to the input type led to occasional overflows. Output of this module is inherently floating point, as it is a multiplication of the recovered bias field by the input image.

The issue discovered and reported by Kilian Pohl.

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