Fix test_deepcopy_objective, test_preeq_guesses

[dweindl]

• Fix test_deepcopy_objective (Fixes test_deepcopy_objective fails #1520)
• Fix test_preeq_guesses

Failures were related to changes in amici's default steady-state settings.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.80%. Comparing base (fae7755) to head (28bc512).

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Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #1521       +/-   ##
============================================
+ Coverage    54.39%   82.80%   +28.41%     
============================================
  Files          163      163               
  Lines        13962    13962               
============================================
+ Hits          7594    11561     +3967     
+ Misses        6368     2401     -3967     

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