Fix "Log" Scaling

[bpaul4]

Fixes/Addresses: #1233

Summary/Motivation:

Corrects unscaling formula for "Log" scaling formulation.

Changes proposed in this PR:

• Fix "Log" unscaling formula
• Updates tests to avoid false successes due to self.min having a value of 1 or 0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.79%. Comparing base (691185f) to head (f7ebea5).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1236      +/-   ##
==========================================
- Coverage   38.81%   38.79%   -0.03%     
==========================================
  Files         164      164              
  Lines       37048    37048              
  Branches     6153     6153              
==========================================
- Hits        14382    14371      -11     
- Misses      21528    21542      +14     
+ Partials     1138     1135       -3     

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[sotorrio1]

LGTM