Fix fix_ij_options docstring and set tested options

[rohangirishrao]

Fix for issue #46

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 25.00%. Comparing base (0c97f2a) to head (b9a22c1).
Report is 10 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/imcflibs/imagej/prefs.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            devel      #69      +/-   ##
==========================================
+ Coverage   24.98%   25.00%   +0.01%     
==========================================
  Files          25       25              
  Lines        1661     1660       -1     
==========================================
  Hits          415      415              
+ Misses       1246     1245       -1     

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