Increase the maximum for init_guess_TR_SS

[rickecon]

This PR increases the maximum value of init_guess_TR_SS in the default_parameters.json file. The current maximum is 0.2. However, this variable is in model units and is not a percentage. As such, its values in the SS can be significantly bigger than 0.2. This is the case in OG-PHL. The maximum value of 2.5 to which I changed it is arbitrary. We may need to increase this value from time-to-time.

cc: @jdebacker

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.67%. Comparing base (1a943f4) to head (4d911d2).
⚠️ Report is 294 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1040   +/-   ##
=======================================
  Coverage   72.67%   72.67%           
=======================================
  Files          20       20           
  Lines        5068     5068           
=======================================
  Hits         3683     3683           
  Misses       1385     1385           

Flag	Coverage Δ
unittests	72.67% <100.00%> (ø)

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Files with missing lines	Coverage Δ
ogcore/__init__.py	100.00% <100.00%> (ø)

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