refactor (cordovaBoolSettingForKey): improve boolean checks and native logging

[erisu]

Motivation and Context

Improve the boolean checks for preference settings and logging.

Description

Updated the cordovaBoolSettingForKey method.

Testing

• npm t
• cordova platform add
• cordova build
• Run in simulator and test with different values

Checklist

• I've run the tests to see all new and existing tests pass

[dpogue]

The keys are automatically lowercased in the dictionary, but the values are not. It would be best to lowercaseString prefObj before doing any comparisons to catch things like "True"

[codecov-io]

Codecov Report

Merging #798 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #798   +/-   ##
=======================================
  Coverage   74.36%   74.36%           
=======================================
  Files          13       13           
  Lines        1845     1845           
=======================================
  Hits         1372     1372           
  Misses        473      473

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