Replace fmi2ModelVariablesForValueReference and fmi3ModelVariablesForValueReference

[halentin]

The functions fmi2ModelVariablesForValueReference and fmi3ModelVariablesForValueReference are not defined anywhere. I believe they were replaced with modelVariablesForValueReference, so i replaced the calls.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 1.21%. Comparing base (80e9151) to head (26fb33c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/md.jl	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@          Coverage Diff          @@
##            main     #36   +/-   ##
=====================================
  Coverage   1.21%   1.21%           
=====================================
  Files         30      30           
  Lines       2560    2560           
=====================================
  Hits          31      31           
  Misses      2529    2529           

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