Rename function to apply_rollingball_bg_subtraction()

[lguerard]

Fixes #59

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 24.98%. Comparing base (ef64219) to head (26ea037).
Report is 3 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/imcflibs/imagej/processing.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            devel      #65   +/-   ##
=======================================
  Coverage   24.98%   24.98%           
=======================================
  Files          25       25           
  Lines        1661     1661           
=======================================
  Hits          415      415           
  Misses       1246     1246           

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