Updating BTX param with units

[JavalVyas2000]

Updating BTX params with units to mutable. This is done to suppress the warning thrown by pyomo.

The changes take place in idaes/models/properties/activity_coeff_models/BTX_activity_coeff_VLE.py

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[andrewlee94]

This looks good to me, and should suppress a lot of annoying warnings.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.36%. Comparing base (2a587ab) to head (d31722e).
Report is 24 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1478      +/-   ##
==========================================
- Coverage   76.37%   76.36%   -0.01%     
==========================================
  Files         393      393              
  Lines       65086    65086              
  Branches    14426    14426              
==========================================
- Hits        49708    49705       -3     
- Misses      12816    12820       +4     
+ Partials     2562     2561       -1     

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