fix att selection

[mdoucet]

Fix the attenuator selection for the scaling factor calculation.
The attenuator column was not passed to the calculation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.52%. Comparing base (51fe80b) to head (b3e0428).

Files	Patch %	Lines
RefRed/sf_calculator/reduction_sf_calculator.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next     #125      +/-   ##
==========================================
- Coverage   60.53%   60.52%   -0.01%     
==========================================
  Files         121      121              
  Lines       10125    10129       +4     
==========================================
+ Hits         6129     6131       +2     
- Misses       3996     3998       +2     

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