Revert "Fix objective sensitivity when parameters appear in the objective"

[andrewrosemberg]

Reverts #337

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.14%. Comparing base (d6b17d9) to head (4222106).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #339      +/-   ##
==========================================
- Coverage   89.17%   89.14%   -0.03%     
==========================================
  Files          16       16              
  Lines        1967     1963       -4     
==========================================
- Hits         1754     1750       -4     
  Misses        213      213              

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