Fix tolerance read-in for optimzation parameters

[andrewwinters5000]

Use doublePrecisionValueForKey instead of realValueForKey to read-in the tolerance value.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.25%. Comparing base (863852d) to head (0e1f097).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   78.25%   78.25%           
=======================================
  Files          83       83           
  Lines       12387    12387           
  Branches        2        2           
=======================================
  Hits         9693     9693           
  Misses       2694     2694           

Flag	Coverage Δ
unittests	78.25% <100.00%> (ø)

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