Remove initial_guess_w_SS from default params

[jdebacker]

This PR removes initial_guess_w_SS from default params per suggestions in OG-Core Issue PSLmodels/OG-Core#1039.

Note that once OG-Core is updated with PR #1042, OG-ZAF will break without this change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.29%. Comparing base (eef1beb) to head (32bd17b).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #99   +/-   ##
=======================================
  Coverage   59.29%   59.29%           
=======================================
  Files          12       12           
  Lines         425      425           
=======================================
  Hits          252      252           
  Misses        173      173           

Flag	Coverage Δ
unittests	59.29% <100.00%> (ø)

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[SeaCelo]

Merging