Fixed one-line error

[jajhall]

Fixes a simple 1-line error

[jajhall]

This will close #2423

[codecov[bot]]

Codecov Report

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

Project coverage is 79.30%. Comparing base (297d0ec) to head (a8ac8b1). Report is 15 commits behind head on latest.

Files with missing lines	Patch %	Lines
highs/util/HighsSparseMatrix.cpp	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2425      +/-   ##
==========================================
- Coverage   79.30%   79.30%   -0.01%     
==========================================
  Files         346      346              
  Lines       85002    85002              
==========================================
- Hits        67415    67409       -6     
- Misses      17587    17593       +6     

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[odow]

Does this indicate that we're missing a lot of tests for this area of the code? I guess all the JuMP tests query row-wise, not col-wise.