[MergeDups] Fix bug preventing use of extra column

[imnasnainaec]

Fixes #3546

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This change is 

[andracc]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @imnasnainaec)

[codecov]

Codecov Report

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

Project coverage is 74.54%. Comparing base (74feaaa) to head (2f5e3d7).
Report is 33 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/goals/MergeDuplicates/Redux/MergeDupsReducer.ts	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3548      +/-   ##
==========================================
- Coverage   74.61%   74.54%   -0.08%     
==========================================
  Files         285      285              
  Lines       11037    11037              
  Branches     1342     1343       +1     
==========================================
- Hits         8235     8227       -8     
- Misses       2421     2426       +5     
- Partials      381      384       +3     

Flag	Coverage Δ
backend	83.79% <ø> (-0.14%)	⬇️
frontend	66.32% <0.00%> (-0.02%)	⬇️

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