Fix fh tol

[nathanemac]

@dpo
With that change, using :

prec = 1e-4
data, simulate, resid, misfit, x0 = RegularizedProblems.FH_smooth_term()
misfit_prec = p -> misfit(p, prec, prec)
inexact_nlp = LBFGSModel(ADNLPModel(misfit_prec, ones(5)))

allows to evaluate the same problem with different precisions (tolerance criterion in DiffEq solving)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.02%. Comparing base (85de184) to head (d45ea16).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #74       +/-   ##
===========================================
- Coverage   99.18%   77.02%   -22.17%     
===========================================
  Files          11       19        +8     
  Lines         369      457       +88     
===========================================
- Hits          366      352       -14     
- Misses          3      105      +102     

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[dpo]

Thank you.