Fix long case insensitive and short case sensitive combo.

[Landberg]

The local_option update for the short_name match was removed in v1.68.0, but it is needed to allow for case insensitive long names combined with case sensitive short names. See #74 for more info about the problem.

[codecov]

Codecov Report

Merging #75 into develop will increase coverage by 0.03%.
The diff coverage is 0%.

@@             Coverage Diff             @@
##           develop      #75      +/-   ##
===========================================
+ Coverage    49.89%   49.92%   +0.03%     
===========================================
  Files           23       23              
  Lines         1385     1386       +1     
  Branches       707      708       +1     
===========================================
+ Hits           691      692       +1     
  Misses         110      110              
  Partials       584      584

Impacted Files	Coverage Δ
src/options_description.cpp	48.46% <0%> (-0.19%)	⬇️
...de/boost/program_options/detail/value_semantic.hpp	43.75% <0%> (+1.56%)	⬆️

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